Python solution

  • 1
        # get the total count of all instances of character in both sets
        # if the counts do not match return that character
        split_str_t = list(t)
        uncontained_str = ''
        for element in split_str_t:
            if s.count(element) != t.count(element):
                uncontained_str = element
        return uncontained_str

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