#include <bits/stdc++.h>
using namespace std;
int main() {
  int tc;
  cin >> tc;
  while (tc--) {
    int n;
    cin >> n;
    if (n == 1)
      cout << -1 << endl;
    else {
      string s;
      s += '4';
      for (int i = 1; i < n; i++) {
        s += '3';
      }
      cout << s << endl;
    }
  }
}
