using System.Text;
using System;

public class Hello
{
    static void Main()
    {
        var T = int.Parse(Console.ReadLine().Trim());
        while (T-- > 0)
        {
            var n = int.Parse(Console.ReadLine().Trim());
            getAns(n);
        }
    }
    static void getAns(int n)
    {
        var ans1 = "ABACBC";
        if (n == 2) { Console.WriteLine(ans1); return; }
        var sb = new StringBuilder();
        for (int i = 0; i < n - 2; i++) sb.Append("ABC");
        Console.Write(ans1);
        Console.WriteLine(sb);
    }
}