#include #define rep(i,n) for(int i=0;i<(int)(n);i++) using namespace std; using ll = long long ; using P = pair ; using pll = pair; constexpr int INF = 1e9; constexpr long long LINF = 1e17; constexpr int MOD = 1000000007; constexpr double PI = 3.14159265358979323846; int main(){ string s; int l = 0,r = 1001; while(r-l>1){ int m = (l+r)/2; cout << "? " << m << endl << flush; cin >> s; if(s=="out"){ r = m; }else{ l = m; } } cout << "? " << l << endl << flush; if(s=="out"){ cout << "! " << l-1 << endl << flush; }else{ cout << "! " << l << endl; } return 0; }