using System;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
namespace DataTypesAndVariablesExercise
{
    public class MethodsAndFunctionsExcercise
    {
        static void Main()
        {
            {
                int num = int.Parse(Console.ReadLine());

                for (int i = 0; i < num; i++)
                {
                    for (int j = 0; j < num; j++)
                    {
                        for (int k = 0; k < num; k++)
                        {
                            Console.WriteLine($"{(char)(i + 'a')}{(char)(j + 'a')}{(char)(k + 'a')}");
                        }
                    }
                }
            }
        }
    }
}