#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define rep2(i, k, n) for (ll i = (ll)(k); i < (ll)(n); i++)
#define repM(i, k, n) for (ll i = (ll)(k); i > (ll)(n); i--)
#define all(v) v.begin(), v.end()
using ll = long long;
ll mod = 998244353;

int main() {
  char c;
  cin >> c;
  cout << "? " << c << c;
  cout.flush();
  while(true){
    char j;
    string back, ans;
    cin >> j >> back;
    if(j == '!'){
      return 0;
    }
    cout << "? " << back[1] << c;
    cout.flush();
  }
}