#include <bits/stdc++.h>   using namespace std;   int solve() {     int n;     cin >> n;     if (n == 1) return cout << -1 << endl, 0;     string s =   ;     for (int i = 0; i < n - 1; i++) s +=  3 ;     cout <<  2  + s << endl;     return 0;   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) solve();     return 0;   }   