#include <bits/stdc++.h>
using namespace std;
bool query(int x, int y) {
  cout << "? " << x << ' ' << y << endl;
  char c;
  cin >> c;
  return c == 'x';
}
int solve() {
  int l = -1;
  int r = -1;
  int u = -1;
  for (int i = 0; i < 30; i++) {
    if (query(1 << i, 1 << (i + 1))) {
      l = (1 << i) - 1;
      r = (1 << (i + 1)) + 1;
      u = l;
      break;
    }
  }
  while (r - l > 1) {
    int m = (r + l) >> 1;
    if (query(u, m)) {
      r = m;
    } else {
      l = m;
    }
  }
  return r;
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  string s;
  cin >> s;
  while (true) {
    if (s == "start") {
      auto res = solve();
      cout << "! " << res << endl;
    } else {
      return 0;
    }
    cin >> s;
  }
}
