def superReducedString(s):
    # Write your code here
    s = [i for i in s]
    stack = []
    for i in s:
        if not stack:
            stack.append(i)
        else:
            if i==stack[-1]:
                stack.pop(-1)
            else:
                stack.append(i)
    if stack:
        return ''.join(stack)
    else:
        return 'Empty String'