#include <bits/stdc++.h>
using namespace std;
char c;
string s;
int x, mid, l, r;
int ans(int a, int b) {
  cout << "? " << a << " " << b << '\n';
  cin >> c;
  if (c == 'x') return 1;
  return 0;
}
int main() {
  while (true) {
    cin >> s;
    if (s[0] != 's') break;
    x = 1;
    while (!ans(x / 2, x)) x *= 2;
    l = x / 2;
    r = x;
    while (l + 1 < r) {
      mid = (l + r) / 2;
      if (ans(l, mid))
        r = mid;
      else
        l = mid;
    }
    cout << "! " << r << '\n';
  }
}
