input: def same_characters(s1: str, s2: str):
      """
      Determine if two strings contain exactly the same set of characters.
      >>> same_characters('eabcdzzzz', 'dddzzzzzzzddeddabc')
      True
      >>> same_characters('abcd', 'dddddddabc')
      True
      >>> same_characters('dddddddabc', 'abcd')
      True
      >>> same_characters('eabcd', 'dddddddabc')
      False
      >>> same_characters('abcd', 'dddddddabce')
      False
      >>> same_characters('eabcdzzzz', 'dddzzzzzzzddddabc')
      False
      """
output:     return set(s1) == set(s2)