#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  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;
    }
  }
}
