#include <bits/stdc++.h>
using namespace std;
long long bins(long long l, long long r) {
  while (l + 1 < r) {
    long long m = (l + r) >> 1;
    cout << "? " << l << " " << m << endl;
    cout.flush();
    char c;
    cin >> c;
    if (c == 'e') return 0;
    if (c == 'y') {
      l = m;
    } else {
      r = m;
    }
  }
  return r;
}
signed main() {
  string s;
  cin >> s;
  long long x, y;
  while (s == "start") {
    x = 0, y = 1;
    char c = 'y';
    bool z = false;
    while (c != 'x') {
      if (!z)
        z = true;
      else
        x = y, y *= 2;
      cout << "? " << x << " " << y << endl;
      cout.flush();
      cin >> c;
      if (c == 'e') return 0;
    }
    long long p = bins(x, y);
    cout << "! " << p << endl;
    cout.flush();
    cin >> s;
    if (s == "mistake") {
      return 0;
    }
    if (s == "end") return 0;
  }
  return 0;
}
