func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int t_1 = -1, t_2 = -1;     int c1 = 0, c2 = 0;     int a = 0;     for (int i = 0; i < n; ++i) {       int t;       cin >> t;       if (t_1 == -1) {         t_1 = t;         c1++;       } else if (t_1 == t) {         c1++;       } else if (t_2 == -1) {         t_2 = t;         c2++;       } else if (t_2 == t) {         c2++;       } else {         a = -1;       }     }     if (n % 2 == 1) a = -1;     if (c1 != c2) a = -1;     if (a == -1)       cout <<  NO  << endl;     else       cout <<  YES n  << t_1 <<     << t_2 << endl;     return 0;   }   