diff --git a/challenge_4/python/whiterd/README.md b/challenge_4/python/whiterd/README.md
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+# Invert Binary Tree
+
+* Take in a binary tree object.
+
+* For each level in the tree, reverse the order of the items in that level (mirror).
+
+* Return the node object.
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diff --git a/challenge_4/python/whiterd/src/invert_bin.py b/challenge_4/python/whiterd/src/invert_bin.py
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+#!/usr/bin/env python
+
+'''
+    Input:  An object consisting of a binary tree.
+
+    Output:  The same tree with values mirrored.
+'''
+
+def mirror(node):
+    if node:
+        mirror(node.left)
+        mirror(node.right)
+        node.left, node.right = node.right, node.left
+        
+    return node
diff --git a/challenge_5/python/whiterd/README.md b/challenge_5/python/whiterd/README.md
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+# Find the Difference
+
+* Assume: two given strings ("s" and "t") of lowercase letters 
+	* "s" is a series of letters (e.g.  s = "abcd")
+	* "t" is an unknow ordering of "s", plus one extra character
+
+* Output: the added character present in "t" that is not in "s".
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diff --git a/challenge_5/python/whiterd/src/find_diff.py b/challenge_5/python/whiterd/src/find_diff.py
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+#!/usr/bin/env python
+
+'''
+    Input: string (series of characters) 
+
+    Process: string input is randomly sorted and and additional character
+        is added.
+        
+    Output: the additional character that is not present in the input.
+'''
+
+from __future__ import print_function
+from random import shuffle, choice
+from string import ascii_lowercase
+
+def get_input():
+    """Asks user for input and returns a string."""
+    return str(input('Enter a series of unique characters: '))
+
+def add_char(s):
+    """Takes a string as input, adds a char, shuffles it, and returns
+    the new string."""
+    t = list(s)
+    other_letters = set(ascii_lowercase) - set(t)
+    t.append(choice(list(other_letters)))
+    shuffle(t)
+    return ''.join(t)
+    
+def find_diff(s, t):
+    """Takes two strings as input and returns the differing character."""
+    for i in t:
+        if i not in s:
+             return i
+
+
+if __name__ == '__main__':
+
+    s = get_input()
+    print('You entered: ' + s)
+    t = add_char(s)
+    print('The newly generated string is: ' + t)
+    print('The different character generated is: ' + find_diff(s, t))