#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    char c;
    cin >> c;
    cout << "? " << c << c << endl;
    string cmd, t;
    while(true){
        cin >> cmd >> t;
        if(cmd[0] == '!') break;
        cout << "? " << t[1] << c << endl;
    }
}