#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  while (s == "start") {
    long long int pow = 1;
    string ans;
    cout << "? " << 0 << " " << 1 << endl;
    cin >> ans;
    if (ans == "x") {
      cout << "! 1" << endl;
    } else {
      do {
        cout << "? " << pow << " " << 2 * pow << endl;
        cin >> ans;
        pow *= 2;
      } while (ans == "y");
      pow /= 2;
      long long int lo = pow;
      long long int hi = 2 * pow;
      while (hi - lo > 1) {
        long long int mid = (hi + lo) / 2;
        cout << "? " << pow << " " << mid << endl;
        cin >> ans;
        if (ans == "y") {
          lo = mid;
        } else
          hi = mid;
      }
      cout << "! " << hi << endl;
    }
    cin >> s;
  }
  return 0;
}
