new_contents: """
  https://leetcode.com/problems/find-the-difference/description/
  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(object):
      def findTheDifference(self, s, t):
          """
          :type s: str
          :type t: str
          :rtype: str
          """
          # return set(list(s)) ^ set(list(t)) doesn't work
          list_t = list(t)
          for char in s:
              list_t.remove(char)
          return list_t[0]
              
          
  
subject: Create 389_find_the_difference.py