def superReducedString(s):
    s = list(s)
    change = True
    while change:
        change = False
        for letter in range(len(s) - 1):
            if letter < len(s) - 1:
                if s[letter] == s[letter + 1]:
                    change = True
                    s.pop(letter)
                    s.pop(letter)
    if s:
        return "".join(s)
    return "Empty String"