#include <bits/stdc++.h>
using namespace std;
int main(){
    int T,N,flg=0;
    cin>>T;
    for(int i=0;i<T;++i){
        cin>>N;
        flg=0;
        if(N%21==0){
            flg=1;
        }
        if(N%21==5){
            cout<<"BCCCD";
            flg=1;
        }
        if(N%21==10){
            cout<<"BBCCCFACAC";
            flg=1;
        }
        if(flg){
            for(int j=0;j<N/21;++j){
                cout<<"ACCACCCCCCCCABACAAFFE";
            }
            cout<<endl;
        }else{
            cout<<-1<<endl;
        }
    }
}