std::list<char> super_reduced_list(std::list<char> &l) {
    int k = l.size();
    
    for(auto it1 = l.begin(), it2 = ++l.begin();
        (it1 != l.end()) && (it2 != l.end());
        ) {
        if(*it1 == *it2) {
            it2 = l.erase(it1);
            it1 = l.erase(it2);
            it2 = it1;
            it2++;
        } else {
				it1++;
				it2++;
				}
    }
    
    for(char c : l) {
        std::cout << c;
    }
    
    std::cout << std::endl;
    
    if(k == l.size()) {
        return l;
    } else {
        return super_reduced_list(l);
    }
}

string superReducedString(string s) {
    std::list<char> l(s.begin(), s.end());
    super_reduced_list(l);
    
    return (l.empty())? "Empty String" : string(l.begin(), l.end());
}