#include <bits/stdc++.h>

using namespace std;

int main(){
    char alpha;
    cin >> alpha;
    char pre = alpha;
    
    while (true) {
        cout << "? " << pre << alpha << endl;
        
        char cmd;
        string T;
        cin >> cmd >> T;
        
        if (cmd == '!') {
            break;
        } else {
            pre = T[1];
        }
    }
    
    return 0;
}