diff --git a/.gitignore.txt b/.gitignore.txt
new file mode 100644
index 0000000..b6085cb
--- /dev/null
+++ b/.gitignore.txt
@@ -0,0 +1,2 @@
+.ipynb_checkpoints/
+mod/__pycache__/
diff --git a/main.ipynb b/main.ipynb
index 73f285a..964446c 100644
--- a/main.ipynb
+++ b/main.ipynb
@@ -20,7 +20,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -37,19 +37,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
     "def greater(a,b):\n",
-    "    pass"
+    "    if a > b:\n",
+    "        return a\n",
+    "    elif b > a:\n",
+    "        return b"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.055s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_greater(greater)"
@@ -64,19 +79,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
     "def greatest(arr):\n",
-    "    pass"
+    "    largest = 0\n",
+    "    for element in arr:\n",
+    "        if element > largest:\n",
+    "            largest = element\n",
+    "    return largest"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.056s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_greatest(greatest)"
@@ -91,19 +122,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sum_all(arr):\n",
-    "    pass"
+    "    sum_ = 0\n",
+    "    for num in arr:\n",
+    "        sum_ += num\n",
+    "    return sum_"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.062s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_sum(sum_all)"
@@ -118,19 +164,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 32,
    "metadata": {},
    "outputs": [],
    "source": [
     "def mult_all(arr):\n",
-    "    pass"
+    "    mult = 1\n",
+    "    for num in arr:\n",
+    "        mult *= num\n",
+    "    return mult"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.057s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_mult(mult_all)"
@@ -145,19 +206,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 34,
    "metadata": {},
    "outputs": [],
    "source": [
     "def oper_all(arr, oper):\n",
-    "    pass"
+    "    if oper == '+':\n",
+    "        return sum_all(arr)\n",
+    "    elif oper == '*':\n",
+    "        return mult_all(arr)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 35,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.058s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_operations(oper_all)"
@@ -172,19 +248,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 39,
    "metadata": {},
    "outputs": [],
    "source": [
     "def factorial(n):\n",
-    "    pass"
+    "    fact = 1\n",
+    "    for num in range(1,n+1):\n",
+    "        fact *= num\n",
+    "    return fact"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 40,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.069s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_factorial(factorial)"
@@ -201,19 +292,36 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 49,
    "metadata": {},
    "outputs": [],
    "source": [
     "def unique(arr):\n",
-    "    pass"
+    "    list_unique = []\n",
+    "    for element in arr:\n",
+    "        if element not in list_unique:\n",
+    "            list_unique.append(element)\n",
+    "    return list_unique\n",
+    "    "
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 50,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.119s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_unique(unique)"
@@ -229,19 +337,43 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 81,
    "metadata": {},
    "outputs": [],
    "source": [
     "def mode_counter(arr):\n",
-    "    pass"
+    "    count = 0\n",
+    "    max_count = 0\n",
+    "    mode = 0\n",
+    "    for element in arr:\n",
+    "        for i in arr:\n",
+    "            if i == element:\n",
+    "                count +=1\n",
+    "        if count > max_count:\n",
+    "            max_count = count\n",
+    "            mode = element\n",
+    "        count = 0\n",
+    "    return mode\n",
+    "                    "
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 82,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.124s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_mode(mode_counter)"
@@ -257,20 +389,49 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 77,
    "metadata": {},
    "outputs": [],
    "source": [
     "from statistics import stdev\n",
     "def st_dev(arr):\n",
-    "    pass"
+    "    \n",
+    "    total_elements = 0\n",
+    "    total_sum_elements = 0\n",
+    "    \n",
+    "    for num in arr:\n",
+    "        total_elements +=1\n",
+    "        total_sum_elements += num\n",
+    "    \n",
+    "    mean = total_sum_elements/total_elements\n",
+    "    \n",
+    "    deviation = 0\n",
+    "    \n",
+    "    for num in arr:\n",
+    "        deviation += (num-mean)**2\n",
+    "    \n",
+    "    standard_deviation = (deviation/(total_elements-1))**0.5\n",
+    "    \n",
+    "    return standard_deviation"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 78,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.063s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_stdev(st_dev)"
@@ -285,19 +446,39 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 73,
    "metadata": {},
    "outputs": [],
    "source": [
     "def pangram(string):\n",
-    "    pass"
+    "    alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']\n",
+    "    is_pangram = True\n",
+    "    \n",
+    "    for letter in alphabet:\n",
+    "        if letter not in string.lower():\n",
+    "            is_pangram = False\n",
+    "            \n",
+    "    return is_pangram\n",
+    "        "
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 74,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "..............................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 30 tests in 0.020s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_pangram(pangram)"
@@ -314,19 +495,52 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sort_alpha(string):\n",
-    "    pass"
+    "    separated_words = []\n",
+    "    string_aux = ''\n",
+    "    \n",
+    "    for character in string:\n",
+    "        if character == ',':\n",
+    "            separated_words.append(string_aux)\n",
+    "            string_aux = ''\n",
+    "            \n",
+    "        else:\n",
+    "            string_aux += character\n",
+    "            \n",
+    "    separated_words.append(string_aux)     \n",
+    "        \n",
+    "    sorted_words = sorted(separated_words)\n",
+    "    \n",
+    "    sorted_string = ''\n",
+    "    \n",
+    "    for element in sorted_words:\n",
+    "        sorted_string += element + ','\n",
+    "    \n",
+    "    return sorted_string[:-1]\n",
+    "        "
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.071s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_alpha(sort_alpha)"
@@ -342,28 +556,76 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 101,
    "metadata": {},
    "outputs": [],
    "source": [
     "def check_pass(string):\n",
-    "    pass"
+    "    total_characters = 0\n",
+    "    lowercase_count = 0\n",
+    "    upperrcase_count = 0\n",
+    "    number_count = 0\n",
+    "    special_char_count = 0\n",
+    "    \n",
+    "    lowercase_letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']\n",
+    "    uppercase_letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']\n",
+    "    numbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']\n",
+    "    special_characters = ['#', '@', '!', '$', '%', '&', '(', ')', '^', '*', '[', ']', '{', '}']\n",
+    "    \n",
+    "    for character in string:\n",
+    "        total_characters += 1\n",
+    "        \n",
+    "        if character in lowercase_letters:\n",
+    "            lowercase_count += 1\n",
+    "            \n",
+    "        elif character in uppercase_letters:\n",
+    "            upperrcase_count += 1\n",
+    "            \n",
+    "        elif character in numbers:\n",
+    "            number_count += 1\n",
+    "            \n",
+    "        elif character in special_characters:\n",
+    "            special_char_count += 1\n",
+    "            \n",
+    "        else:\n",
+    "            return False\n",
+    "    \n",
+    "    return total_characters >= 8 and lowercase_count >=1 and upperrcase_count >=1 and number_count >=1 and special_char_count >=1"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 102,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "....................................................................................................\n",
+      "----------------------------------------------------------------------\n",
+      "Ran 100 tests in 0.032s\n",
+      "\n",
+      "OK\n"
+     ]
+    }
+   ],
    "source": [
     "# This will test your function \n",
     "test_pass(check_pass)"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -377,7 +639,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.6"
+   "version": "3.9.12"
   }
  },
  "nbformat": 4,