def superReducedString(s):
    ans=list(s)
    cha=1
    while cha==1:
        cha=0
        for i in range(len(ans)-1):
            if ans[i]==ans[i+1]:
                ans[i]='0'
                ans[i+1]='0'
        prev=ans[:]
        ans= [num for num in ans if num != '0']
        if prev!=ans:
            cha=1
    if ans ==[]:
        return 'Empty String'
    return ''.join(ans)