#include <bits/stdc++.h>
using namespace std;
template <class c>
struct rge {
  c b, e;
};
template <class c>
rge<c> range(c i, c j) {
  return rge<c>{i, j};
}
template <class c>
auto dud(c* x) -> decltype(cerr << *x, 0);
template <class c>
char dud(...);
struct debug {
  template <class c>
  debug& operator<<(const c&) {
    return *this;
  }
};
vector<char*> tokenizer(const char* args) {
  char* token = new char[111];
  strcpy(token, args);
  token = strtok(token, ", ");
  vector<char*> v({token});
  while (token = strtok(NULL, ", ")) v.push_back(token);
  return reverse(v.begin(), v.end()), v;
}
void debugg(vector<char*> args) { cerr << "\b\b "; }
template <typename Head, typename... Tail>
void debugg(vector<char*> args, Head H, Tail... T) {
  debug() << " [" << args.back() << ": " << H << "] ";
  args.pop_back();
  debugg(args, T...);
}
long long mod = 1e9 + 7;
const int MX = 0x3f3f3f3f;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long p[32];
  p[0] = 1;
  for (int i = 1; i < 32; i++) p[i] = 2 * p[i - 1];
  while (1) {
    string s;
    cin >> s;
    if (s == "mistake" || s == "end") return 0;
    long long x = 0, y, i = 0;
    char ch;
    while (1) {
      y = x + p[i];
      cout << "? " << x << " " << y << endl;
      cin >> ch;
      if (ch == 'e')
        return 0;
      else if (ch == 'y')
        i++, x = y;
      else {
        long long l = x, r = y, mid, ans;
        while (l < r) {
          mid = (l + r + 1) / 2;
          cout << "? " << x << " " << mid << endl;
          cin >> ch;
          if (ch == 'e')
            return 0;
          else if (ch == 'x')
            r = mid - 1, ans = mid;
          else
            l = mid;
        }
        cout << "! " << ans << endl;
        break;
      }
    }
  }
  return 0;
}
