#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    if (n == 1) {
      cout << -1 << endl;
    } else {
      cout << 2;
      for (int i = 2; i <= n; i++) {
        cout << 3;
      }
      cout << endl;
    }
  }
  return 0;
}
