#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <string>
#include <utility>
#include <tuple>
#include <set>
#include <map>
#include <cassert>

using namespace std;

string query(char c1, char c2) {
	cout << "? " << c1 << c2 << endl;
	char c;
	string t;

	cin >> c >> t;

	// fprintf(stderr, "c %c, t '%s'\n", c, t.c_str());

	if (c == '!') {
		return "";
	} else {
		return t;
	}
}


int main() {
	char alpha;
	cin >> alpha;

	string ret = query(alpha, alpha);

	while (ret.size()> 0) {
		ret = query(ret[1], ret[0]);
	}

	return 0;
}