#include <bits/stdc++.h>
using namespace std;
const long long mod = 998244353;
int mx = (int)1e9;
char an;
void ask_query(int i, int j) {
  cout << "? " << i << " " << j << endl;
  cin >> an;
  if (an == 'e') exit(0);
}
int solbin(int l, int r) {
  if (r == l + 1) return r;
  int mid = (l + r) / 2;
  ask_query(l, mid);
  if (an == 'x') {
    return solbin(l, mid);
  } else {
    return solbin(mid, r);
  }
}
int sol(int shift, int en) {
  if (en == 2) {
    ask_query(shift, shift + 1);
    if (an == 'y') {
      return shift + 2;
    } else {
      return shift + 1;
    }
  }
  an = 'y';
  int i = 0, j = 2;
  int it = 0;
  while (an != 'x' && 2 * j < en) {
    if (it != 0) {
      i = j;
      j = min(2 * j, en);
    }
    ask_query(shift + i, shift + j);
    it++;
  }
  if (2 * j >= en && an != 'x') {
    i = j;
    j = en;
  }
  return solbin(shift + i, shift + j);
}
void solve() {
  string s;
  cin >> s;
  while (s == "start") {
    int ans = sol(0, mx);
    cout << "! " << ans << endl;
    cin >> s;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long t;
  t = 1;
  while (t--) {
    solve();
  }
}
