#include <iostream>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	char alpha, status, S[3];
	cin >> alpha;

	cout << "? " << alpha << alpha << endl;
	while (cin >> status >> S, status == '?')
		cout << "? " << S[1] << alpha << endl;

	return 0;
}