#include <bits/stdc++.h>
using namespace std;
const int fx[4][2] = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
const int fxx[8][2] = {{0, 1}, {0, -1}, {1, 0},  {-1, 0},
                       {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};
template <typename T, typename TT>
ostream& operator<<(ostream& s, pair<T, TT> t) {
  return s << "(" << t.first << "," << t.second << ")";
}
template <typename T>
ostream& operator<<(ostream& s, vector<T> t) {
  for (int i = 0; i < ((int)(t.size())); i++)
    s << t[i] << (i == ((int)(t.size())) - 1 ? '\n' : ' ');
  return s;
}
int start, finish, mid;
string answer;
int main() {
  cin >> answer;
  while (answer == "start") {
    start = 0;
    finish = 1;
    while (true) {
      cout << "? " << start << " " << finish << endl;
      cin >> answer;
      if (answer == "x") {
        break;
      }
      start = finish;
      finish <<= 1;
    }
    while (start < finish - 1) {
      mid = (start + finish + 1) >> 1;
      cout << "? " << start << " " << mid << endl;
      cin >> answer;
      if (answer[0] == 'x')
        finish = mid;
      else
        start = mid;
    }
    cout << "! " << finish << endl;
    cin >> answer;
  }
  return 0;
}
