#include <bits/stdc++.h>
using namespace std;
bool check(int m, int y) {
  cout << "? " << m << ' ' << y << endl;
  fflush(stdout);
  char x;
  cin >> x;
  return x == 'y';
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  string ss;
  cin >> ss;
  while (ss == "start") {
    int a = 1;
    while (check(a, 2 * a)) a *= 2;
    if (!check(0, a)) {
      cout << "! " << a << endl;
      fflush(stdout);
      cin >> ss;
      continue;
    }
    int s = a + 1, e = 2 * a, ans = -1;
    while (s <= e) {
      int mid = (s + e) >> 1;
      if (!check(a, mid))
        e = mid - 1, ans = mid;
      else
        s = mid + 1;
    }
    cout << "! " << ans << endl;
    fflush(stdout);
    cin >> ss;
  }
  return 0;
}
