func_code_string: #include <bits/stdc++.h>   using namespace std;   string rep(string s, int x) {     string res;     while (x--) res += s;     return res;   }   int ask(string str) {     cout << str <<   n ;     fflush(stdout);     int x;     cin >> x;     return x;   }   int main() {     int a = ask( a );     if (a == 0) return 0;     int len = a + 1;     if (len > 300) {       ask(rep( b , len - 1));       return 0;     }     string s = rep( a , len);     int curres = ask(s);     if (curres == len) {       ask(rep( b , len - 1));       return 0;     }     for (int i = 0; i < len - 1; i++) {       s[i] =  b ;       int nxt = ask(s);       if (nxt == 0) return 0;       if (nxt < curres) {         curres = nxt;       } else {         s[i] =  a ;       }     }     s[len - 1] =  b ;     ask(s);   }   