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