func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string x;     cin >> x;     int i, j;     int len = x.size();     int count = 0;     for (i = 0; i < len; i++) {       for (j = 1; j <= len - i; j++) {         string z = x.substr(i, j);         if (z ==  Danil  || z ==  Olya  || z ==  Slava  || z ==  Ann  ||             z ==  Nikita )           count++;       }     }     if (count == 1)       cout <<  Yes ;     else       cout <<  No ;   }   