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