#include <bits/stdc++.h>
using namespace std;
int main() {
  while (true) {
    string s;
    cin >> s;
    if (s != "start") return 0;
    int l = 0, r = 1000000000;
    while (r - l > 1) {
      int mid = (l + r) / 2;
      cout << "? " << mid << " " << r << endl;
      string s;
      cin >> s;
      if (s == "e") return 0;
      if (s == "x")
        l = mid;
      else
        r = mid;
    }
    int a = r;
    for (int i = 2; i * i <= r; i++)
      if (r % i == 0) {
        int cnt = 0;
        while (r % i == 0) r /= i, cnt++;
        for (int j = 0; j < cnt; j++) {
          a /= i;
          cout << "? 0 " << a << endl;
          string s;
          cin >> s;
          if (s == "e") return 0;
          if (s == "y") {
            a *= i;
            break;
          }
        }
      }
    if (r > 1) {
      a /= r;
      cout << "? 0 " << a << endl;
      string s;
      cin >> s;
      if (s == "e") return 0;
      if (s == "y") a *= r;
    }
    cout << "! " << a << endl;
  }
}
