func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s1, s2, s3;     cin >> s1 >> s2 >> s3;     int i;     s1 = s1.append(s2);     sort(s1.begin(), s1.end());     sort(s3.begin(), s3.end());     if (s1.length() != s3.length()) {       cout <<  NO ;       return 0;     } else {       for (i = 0; i < s1.length(); i++) {         if (s1[i] != s3[i]) {           cout <<  NO ;           return 0;         }       }       cout <<  YES ;     }     return 0;   }   