#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    char c;
    cin >> c;
    cout << "? " << c << c << endl;
    while(1){
        char t;
        string s;
        cin >> t >> s;
        if(t=='!'){
            break;
        }

        cout << "? " << s[1] << "a" << endl;
    }
}