func_code_string: #include <bits/stdc++.h>   using namespace std;   inline long long read(void) {     long long x = 0, f = 1;     char ch = getchar();     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = x * 10 + ch -  0 ;       ch = getchar();     }     return f * x;   }   int n;   int main() {     n = read();     int l = 0, r = 1000000000;     cout << 1 <<     << 0 << endl;     fflush(stdout);     char ch[10];     scanf( %s , ch + 1);     bool flag = false;     if (ch[1] ==  b ) {       flag = true;     }     for (register int i = 1; i < n; ++i) {       int mid = (l + r + 1) >> 1;       cout << 1 <<     << mid << endl;       fflush(stdout);       scanf( %s , ch + 1);       if (flag) {         ch[1] = (ch[1] ==  w ) ?  b  :  w ;       }       if (ch[1] ==  w ) {         l = mid;       } else {         r = mid;       }     }     printf( 0 %d 2 %d , l, l + 1);     return 0;   }   