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.
Input: s = "abcd" t = "abcde" Output: e Explanation: 'e' is the letter that was added.
class Solution(object): def findTheDifference(self, s, t): """ :type s: str :type t: str :rtype: str """ result =  for ti in t: result.append(ti) for si in s: result.remove(si) return "".join(result)