#include<bits/stdc++.h>
using namespace std;
int T,n,p;
int f[7]={0,-1,1,7,4,2,6};
int g[7]={8,10,18,200,20,28,68};
int main()
{
	cin>>T;
	while(T--)
	{
		cin>>n;
		if(n<=6)
		{
			cout<<f[n]<<'\n';
			continue;
		}
		if(n==10)
		{
			cout<<"22\n";
			continue;
		}
		p=n/7-1;
		n=n%7;
		if(n==3) p--;
		cout<<g[n];
		while(p--) cout<<8;
		cout<<'\n';
	}
	return 0;
}