diff --git a/__pycache__/exercise.cpython-36.pyc b/__pycache__/exercise.cpython-36.pyc
new file mode 100644
index 0000000..c3ef2d7
Binary files /dev/null and b/__pycache__/exercise.cpython-36.pyc differ
diff --git a/exercise.py b/exercise.py
index 0ae90ce..b496ecc 100644
--- a/exercise.py
+++ b/exercise.py
@@ -1,32 +1,64 @@
 # problem 1
 # ------------------------------------------------------------------- #
-people = ['Bob Smith', 'Ken Jones', 'Alex Bradino']
-
-
-def sort_by_last_name(people, order):
+def sort_by_last_name(people):
     # return full names sorted by last name in either ascending or descending order
     # add doctests make sure it passes
+    """ Test sort_by_last_name
+
+    Args:
+        people : the first parameter
+        order : the second parameter
+    Returns:
+        x : return value
+        y : return value 2
+    >>> sort_by_last_name(['Bob Smith', 'Ken Jones', 'Alex Bradino'])
+        ['Alex Bradino', 'Ken Jones','Bob Smith']
+    """
+    x = sorted(people, key=lambda name: name.split(" ")[-1])
+    return (x)
     pass
 
 
 # problem 2
 # ------------------------------------------------------------------- #
-names = ['James', 'Susan', 'Maggie']
-ages = [4, 9, 12]
-
-
 def create_dictionary_from_lists(names, ages):
     # {'James':4, 'Susan':9, 'Maggie':12}
     # add doctests make sure it passes
+    """ Test create_dictionary_from_lists
+
+    Args:
+        names : the first parameter
+        ages : the second parameter
+    Returns:
+        new_dict : return value
+    >>> create_dictionary_from_lists(['James', 'Susan', 'Maggie'],[4, 9, 12])
+        {'James': 4, 'Susan': 9, 'Maggie': 12}
+    """
+    new_dict = dict(zip(names, ages))
+    return (new_dict)
     pass
 
 
 # problem 3
 # ------------------------------------------------------------------- #
-numbers = [5, 6, 7, 8, 9, 10, 11, 12]
-
 
 def square_even_values_and_sum_under_10(numbers):
     # 6^2 + 8^2]
     # add doctests make sure it passes
+    """ Test square of evens
+
+    Args:
+        numbers : the first parameter
+
+    Returns:
+        squares : return value
+    >>> square_even_values_and_sum_under_10([5, 6, 7, 8, 9, 10, 11, 12])
+        100
+    """
+    l1 = filter(lambda n: n < 10, numbers))
+    sum = 0
+    for i in l1:
+        if i % 2 == 0:
+        sum = sum + (i*i)
+        return (sum)
     pass