#include <bits/stdc++.h>
using namespace std;
inline int ask(int x, int y) {
  cout << "? " << x << ' ' << y << endl;
  string res;
  cin >> res;
  if (res == "e") {
    exit(0);
  }
  return res == "y";
}
int main() {
  while (true) {
    string s;
    cin >> s;
    if (s != "start") break;
    int _prv = 0, _new = 1;
    while (true) {
      if (ask(_prv, _new)) {
        _prv = _new;
        _new *= 2;
        continue;
      } else {
        break;
      }
    }
    while (_prv + 1 < _new) {
      int mid = (_prv + _new) / 2;
      if (ask(_prv, mid))
        _prv = mid;
      else
        _new = mid;
    }
    cout << "! " << _prv + 1 << endl;
  }
  return 0;
}
