#include <bits/stdc++.h>
using namespace std;
void binary(int a, int b, int pp) {
  if ((a == b) || (a + 1 == b))
    cout << "!"
         << " " << a + 1 << endl;
  else {
    long long int mid = (a + b) / 2;
    cout << "?"
         << " " << pp << " " << mid << endl;
    char temp;
    cin >> temp;
    if (temp == 'x') {
      binary(a, mid, pp);
    } else {
      binary(mid, b, pp);
    }
  }
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  string s;
  cin >> s;
  while (s == "start") {
    cout << "?"
         << " " << 0 << " " << 1 << endl;
    char temp;
    cin >> temp;
    long long int pp = 1;
    if (temp == 'x') {
      cout << "!"
           << " " << 1 << endl;
      cin >> s;
      continue;
    }
    while (temp == 'y') {
      cout << "?"
           << " " << pp << " " << 2 * pp << endl;
      cin >> temp;
      if (temp == 'x') break;
      pp = 2 * pp;
    }
    binary(pp, 2 * pp, pp);
    cin >> s;
  }
  return 0;
}
