func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int count0(0), count5(0);     for (int i = 1; i <= n; i++) {       int a;       cin >> a;       if (a == 0) count0++;       if (a == 5) count5++;     }     if (count0 == 0)       cout << -1;     else if (count5 < 9)       cout << 0;     else {       for (int i = 0; i < floor(count5 / 9); i++) {         cout << 555555555;       }       for (int i = 0; i < count0; i++) cout << 0;     }   }   