using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _06.DNA_Sequences
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] nucleotides = new string[] { "", "A", "C", "G", "T" };

            int value = int.Parse(Console.ReadLine());

            int counter = 0;
            for (int i = 1; i <5; i++)
            {
                for (int j = 1; j <5; j++)
                {
                    for (int k = 1; k < 5; k++)
                    {
                        if(i+j+k>=value)
                        {
                            Console.Write($"O{nucleotides[i]}{nucleotides[j]}{nucleotides[k]}O ");
                            counter++;
                        }
                        else
                        {
                            Console.Write($"X{nucleotides[i]}{nucleotides[j]}{nucleotides[k]}X ");
                            counter++;
                        }
                        if (counter == 4)
                        {
                            Console.WriteLine();
                            counter = 0;
                        }
                    }
                }
            }
        }
    }
}