#include <bits/stdc++.h>
using namespace std;
char v[10];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie();
  cout.tie();
  long long n, k, i, j = 0, cnt = 0, pzs = 1, psj = 1, cur = 1, pz;
  char c;
  while (cin >> v) {
    if (v[0] == 'e') return 0;
    cur = 1;
    cout << "? " << cur << ' ' << cur * 2LL << '\n';
    cin >> c;
    cout << flush;
    if (c == 'x') {
      cout << "? " << 2 << ' ' << 3 << '\n';
      cin >> c;
      cout << flush;
      if (c == 'x') {
        cout << "! " << 1 << '\n';
        cout << flush;
        continue;
      } else {
        cout << "! " << 2 << '\n';
        cout << flush;
        continue;
      }
    }
    while (c == 'y') {
      cur *= 2;
      cout << "? " << cur << ' ' << cur * 2LL << '\n';
      cin >> c;
      cout << flush;
    }
    pz = cur;
    cur /= 2LL;
    while (cur) {
      cout << "? " << pz << ' ' << pz + cur << '\n';
      cin >> c;
      cout << flush;
      if (c == 'y') pz += cur;
      cur /= 2LL;
    }
    cout << "! " << pz + 1 << '\n';
    cout << flush;
  }
  return 0;
}
