#include<iostream>
using namespace std;
#define int long long
int T,n,tim=0;
int zero=6,one=2,two=5,three=5,four=4,five=5,six=6,seven=3,eight=7,nine=6;
signed main(){
	cin>>T;
	while(T--){
		tim++;
		cin>>n;
		if(n==2){
			cout<<2<<endl;
			n=n-2;
		}
		if(n==3){
			cout<<7<<endl;
			n=n-3;
		}
		if(n==4){
			cout<<4<<endl;
			n=n-4;
		}
		if(n==5){
			cout<<2<<endl;
			n=n-5;
		}
		if(n==6){
			if(tim==1){
				cout<<6<<endl;
			}
			else cout<<0<<endl;
			n=n-6;
		}
		if(n==8){
			cout<<8<<endl;
			n=n-8;
		}
		if(n<2){
			cout<<-1<<endl;
		}
		while(n>8){
			n-=8;
			if(n==2){
			cout<<2;
			n=n-2;
		}
		if(n==3){
			cout<<7;
			n=n-3;
		}
		if(n==4){
			cout<<4;
			n=n-4;
		}
		if(n==5){
			cout<<2;
			n=n-5;
		}
		if(n==6){
			if(tim==1){
				cout<<6;
			}
			else cout<<0;
			n=n-6;
		}
		if(n==8){
			cout<<8;
			n=n-8;
			}
		}
	}
	return 0;
} 

好了，$200$分，明年见了（躲在被窝里偷偷哭泣）