#include<iostream>
using namespace std;
int T;
main()
{
	cin>>T;
	for(;T--;)
	{
		int N;cin>>N;
		int n=N%21;
		string S="";
		for(int t=0;t<N/21;t++)S+="ACCACCCCCCCCABACAAFFE";
		if(n==0)
		{
			cout<<S<<endl;
		}
		else if(n==5)
		{
			cout<<"AEECC"<<S<<endl;
		}
		else if(n==10)
		{
			cout<<"BBCCCFACAC"<<S<<endl;
		}
		else
		{
			cout<<-1<<endl;
		}
	}
}