Given two strings s and t which consist of only lowercase letters.
String t is generated by random shuffling string s and then add one more letter at a random position.
Find the letter that was added in t.
Example:
Input:
s = "abcd"
t = "abcde"
Output:
e
Explanation:
'e' is the letter that was added.
class Solution:
     def findTheDifference(self, s, t):
         """
         :type s: str
         :type t: str
         :rtype: str
         """
         for i in set(t):
             if i not in set(s) or t.count(i)>s.count(i):
                 return i
class Solution:
     def findTheDifference(self, s, t):
         """
         :type s: str
         :type t: str
         :rtype: str
         """
         for i in set(t):
             if i not in set(s) or t.count(i)>s.count(i):
                 return i