func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     cout <<  0 0  << endl;     string left;     cin >> left;     int l = 0, r = 1e9;     for (int i = 1; i < n; i++) {       int mid = (l + r) / 2;       cout << mid <<   1  << endl;       string s;       cin >> s;       if (s == left) {         l = mid;       } else {         r = mid;       }     }     cout << l <<   2   << r <<   0  << endl;     return 0;   }   