#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;
        } 
        if (cmd == '?') {
            pre = t[1];
        }
    }
    return 0;
}