#include<bits/stdc++.h>
using namespace std;
string s[10005]={"-1","-1","1","7","4","2","6","8","10","18","22","20","28","68","88","108","188","200","208","288","688","888"};
int main(){
	for(int i=15;i<=1000;i++)
	{
		s[i]=s[i-7]+"8";
	}
	int n,t;
	cin>>t;
	while(t--){
		cin>>n;
		cout<<s[n]<<endl;
	}
    return 0;
}

大佬勿喷。