#include <bits/stdc++.h>
using namespace std;
int main() {
  string str;
  while (cin >> str) {
    if (str == "start") {
      long long x = 0, y = 1;
      while (1) {
        cout << "? " << x << " " << y << endl;
        cin >> str;
        if (str == "x") {
          break;
        } else {
          x = y;
          y = 2 * y;
        }
      }
      long long cns = x;
      x = x + 1;
      long long mid;
      while (x < y) {
        mid = (x + y) / 2;
        cout << "? " << cns << " " << mid << endl;
        cin >> str;
        if (str == "x") {
          y = mid;
        } else {
          x = mid + 1;
        }
      }
      cout << "! " << x << endl;
    }
  }
  return 0;
}
