#include <bits/stdc++.h>
using namespace std;
bool get(long long x, long long y) {
  cout << "? " << x << " " << y << endl;
  char c;
  cin >> c;
  if (c == 'x') {
    return false;
  } else if (c == 'y') {
    return true;
  } else {
    exit(924);
  }
}
void solve() {
  long long l, r = -1;
  for (long long i = 0; i < 30; ++i) {
    if (!get(max(0ll, 1ll << (i - 1)), 1ll << i)) {
      r = 1 << i;
      break;
    }
  }
  if (r == -1) {
    r = 1ll << 30;
  }
  long long end = r;
  l = r / 2;
  while (l + 1 < r) {
    long long m = (l + r) / 2;
    if (get(m, end)) {
      r = m;
    } else {
      l = m;
    }
  }
  cout << "! " << r << endl;
}
signed main() {
  srand(48795629);
  while (true) {
    string s;
    cin >> s;
    if (s != "start") {
      break;
    }
    solve();
  }
  return 0;
}
