// See https://aka.ms/new-console-template for more information
using System.Collections;
using System.Runtime.InteropServices;

internal class Program
{
    public static void Main(string[] args)
    {
        int T = int.Parse(Console.ReadLine());
        for (int t = 0; t < T; t++)
        {
            int n = int.Parse(Console.ReadLine());
            string ans = "ABACBC";
            for (int i = 2; i < n; i++)
            {
                ans += "ABC";
            }
            Console.WriteLine(ans);
        }
    }

    public static List<int> mkar(int n, int val)
    {
        List<int> res = new List<int>(n);
        for(int i=0;i<n;i++)res.Add(val);
        return res;
    }
}