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

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	char a;
	cin >> a;
	cout << "? " << a << a << endl;
	while (true) {
		char state;
		string t;
		cin >> state >> t;
		if (state == '!') {
			return 0;
		}
		cout << "? " << t.back() << a << endl;
	}
}