#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 9;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  string s;
  while (1) {
    cin >> s;
    if (s[0] == 'e' || s[0] == 'm') {
      return 0;
    }
    int l = 1;
    while (l < 1e9) {
      cout << "? " << l << " " << 2 * l << endl;
      cin >> s;
      if (s == "x") {
        break;
      }
      l *= 2;
    }
    if (l == 1) {
      cout << "? 0 1" << endl;
      cin >> s;
      if (s == "x")
        cout << "! 1" << endl;
      else
        cout << "! 2" << endl;
      continue;
    }
    int lo = l, hi = 2 * l, mid = hi - 1;
    while (lo <= hi) {
      mid = (lo + hi) / 2;
      cout << "? " << l << " " << mid << endl;
      cin >> s;
      if (s[0] == 'e') {
        return 0;
      }
      if (s == "y" || mid == l) {
        lo = mid + 1;
      } else
        hi = mid - 1;
    }
    cout << "! " << lo << endl;
  }
  return 0;
}
