func_code_string: #include <bits/stdc++.h>   using namespace std;   const int Y = 10;   int n;   string fcol =   ;   bool place(int y, int x) {     cout << x <<     << y << endl;     string ret;     cin >> ret;     return (ret == fcol);   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cin >> n;     cout <<  0   << Y << endl;     cin >> fcol;     bool lastbl = true;     int cx = 0;     int jmp = (1 << 28);     for (int i = 0; i < n - 1; ++i) {       if (lastbl) {         lastbl = place(Y, cx + jmp);         cx += jmp;       } else {         lastbl = place(Y, cx - jmp);         cx -= jmp;       }       jmp /= 2;     }     if (lastbl) {       cout << cx <<     << Y + 1 <<     << cx + 1 <<     << Y - 1 << endl;     } else {       cout << cx <<     << Y + 1 <<     << cx - 1 <<     << Y - 1 << endl;     }     return 0;   }   