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