#include <bits/stdc++.h>
using namespace std;
string s;
void rd() {
  cin >> s;
  if (s != "start") exit(0);
}
int q(int x, int y) {
  cout << "? " << x << ' ' << y << endl;
  cin >> s;
  if (s[0] == 'x') return 1;
  if (s[0] == 'y') return 0;
  exit(0);
}
int main() {
  int i, l, r;
  while (1) {
    rd();
    if (q(0, 1)) {
      cout << "! " << 1 << endl;
      continue;
    }
    for (i = 1; 1; i <<= 1)
      if (q(i, i + i)) break;
    for (l = i + 1, r = i + i; l < r;) {
      i = ((long long)l + r) / 2;
      if (q(i, r))
        l = i + 1;
      else
        r = i;
    }
    cout << "! " << l << endl;
  }
  return 0;
}
