#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 << "6";
      for (int i = 1; i < n; i++) cout << "9";
      cout << "\n";
    }
  }
}
