Added solution

Author: avidLearnerInProgress

find_the_difference.py

@@ -0,0 +1,13 @@
+class Solution:
+    def findTheDifference(self, s: str, t: str) -> str:
+        from collections import Counter
+        hashed_s, hashed_t = dict(Counter(s)), dict(Counter(t))
+        found = ""
+        for char in t:
+            if char not in hashed_s:
+                found = char
+                return found
+            elif hashed_s[char] != hashed_t[char]:
+                found = char
+                return found
+        return None