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