#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios_base ::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
  while (true) {
    string s;
    cin >> s;
    if (s[0] == 'e') {
      break;
    }
    if (s[0] == 'm') {
      return 0;
    }
    long long a = 1;
    long long x = 1, y = 2;
    while (true) {
      cout << "? " << x << " " << y << "\n" << flush;
      char c;
      cin >> c;
      if (c == 'e') {
        return 0;
      }
      if (c == 'x') {
        break;
      } else {
        x = y;
        y = 2 * x;
      }
    }
    if (x == 1) {
      cout << "? "
           << "2 1"
           << "\n"
           << flush;
      char c;
      cin >> c;
      if (c == 'x') {
        x = 1;
        y = 1;
      } else {
        x = 2;
        y = 2;
      }
    }
    while (x < y) {
      long long m = (x + y) / 2;
      cout << "? " << x << " " << m << "\n" << flush;
      char c;
      cin >> c;
      if (c == 'e') {
        return 0;
      }
      if (c == 'x') {
        y = m;
      } else {
        x = m;
      }
      m = (x + y) / 2;
      if (x == m) {
        x = m + 1;
        y = m + 1;
        break;
      }
    }
    a = (x + y) / 2;
    cout << "! " << a << "\n" << flush;
  }
  return 0;
}
