#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long int n;     cin >> n;     long long int mc[6];     mc[0] = mc[5] = 0;     for (long long int i = 0, k = 0; i < n; i++) {       cin >> k;       mc[k] += 1;     }     if (mc[0] < 1)       cout << -1;     else if (mc[5] < 9)       cout << 0;     else {       for (long long int i = 0; i < mc[5] / 9 * 9; i++) cout << 5;       for (long long int i = 0; i < mc[0]; i++) cout << 0;     }     return 0;   }   