#include <bits/stdc++.h>
using namespace std;
class Solution {
 public:
  bool play() {
    int limit = 60;
    int l = 0;
    int r = 1;
    auto ask = [](int x, int y) -> int {
      cout << "? " << x << " " << y << '\n';
      cout << flush;
      string ans;
      cin >> ans;
      if (ans == "x") {
        return 0;
      } else if (ans == "y") {
        return 1;
      } else {
        return -1;
      }
    };
    auto answer = [](int a) {
      cout << "! " << a << '\n';
      cout << flush;
    };
    while (limit-- > 0) {
      int res = ask(l, r);
      if (res < 0) {
        return false;
      }
      if (res == 0) {
        break;
      } else {
        l = r;
        r = r + r;
      }
    }
    int a = l++;
    while (l < r && limit-- > 0) {
      int m = l + (r - l) / 2;
      int ans = ask(a, m);
      if (ans < 0) {
        return false;
      } else if (ans == 0) {
        r = m;
      } else {
        l = m + 1;
      }
    }
    answer(l);
    return true;
  }
};
int main(int argc, char** argv) {
  ios::sync_with_stdio(false);
  cin.tie(0);
  Solution sol;
  while (true) {
    cout << flush;
    string s;
    cin >> s;
    if (s == "start") {
      if (!sol.play()) {
        break;
      }
    } else {
      if (s == "mistake") {
      } else if (s == "end") {
      } else {
      }
      break;
    }
  }
  return 0;
}
