#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void solve() {
  ll low = 0, high = 0, mid;
  char response = 'y';
  while (response == 'y') {
    low = high;
    high = max(2 * low, (ll)1);
    cout << "? " << low << " " << high << endl;
    cin >> response;
  }
  while (low < high) {
    mid = (high + low + 1) / 2;
    cout << "? " << low << " " << mid << endl;
    cin >> response;
    if (response == 'y') {
      low = mid;
    } else {
      high = mid - 1;
    }
  }
  cout << "! " << high + 1 << endl;
  return;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  string s;
  cin >> s;
  while (s == "start") {
    solve();
    cin >> s;
  }
  return 0;
}
