func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k, five = 0, zero = 0;     cin >> n;     while (n--) {       cin >> k;       if (k == 5)         five += 1;       else         zero += 1;     }     if (five >= 9 && zero > 0) {       for (size_t i = 0; i < five / 9; i++) cout <<  555555555 ;       for (size_t i = 0; i < zero; i++) cout <<  0 ;     } else if (zero > 0)       cout <<  0 ;     else       cout <<  -1 ;   }   