#include <bits/stdc++.h>
using namespace std;
using LL = long long;
int main() {
  string com, ans;
  while (cin >> com) {
    if (com != "start") break;
    cout << "? 0 1" << endl;
    cin >> ans;
    if (ans == "x") {
      cout << "! 1" << endl;
    } else {
      LL l = 1, r = 2;
      bool flag = true;
      while (flag) {
        cout << "? " << l << " " << r << endl;
        cin >> ans;
        if (ans == "x") {
          flag = false;
        } else {
          l <<= 1;
          r <<= 1;
        }
      }
      l++;
      while (l <= r) {
        LL mid = (l + r) >> 1;
        cout << "? " << mid << " " << l - 1 << endl;
        cin >> ans;
        if (ans == "x")
          l = mid + 1;
        else if (ans == "y")
          r = mid - 1;
        else
          return 0;
      }
      cout << "! " << l << endl;
    }
  }
  return 0;
}
