1326A - Bad Ugly Numbers - CodeForces Solution

#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 << "2";
    for (int i = 0; i < n - 1; i++)
        cout << "3";
    cout << "\n";
      
    }
        
    }
}