#include <bits/stdc++.h>
using namespace std;
int main(){
	char c;
	cin >> c;
	cout << "? " << c << c << endl;
	while (true){
		char d;
		cin >> d;
		if (d == '!'){
			return 0;
		}
		string S;
		cin >> S;
		cout << "? " << S[1] << c << endl;
	}
}