#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#ifdef local
#include <C++/core/io/debug_print.hpp>
#else
#define dump(...) void(0);
#endif

#include <iostream>
#include <ranges>
#include <cassert>
#include <algorithm>
namespace man {

}
int main() {
    std::cin.tie(nullptr) -> sync_with_stdio(false);
    using namespace std::views;
    char a;
    std::cin >> a;
    std::string s(2, a);
    while(true) {
        std::cout << "? " << s << std::endl;
        char jdg;
        std::cin >> jdg >> s;
        if(jdg == '!') {
            std::exit(0);
        }
        assert(std::ssize(s) == 2);
        std::ranges::reverse(s);
    }
}