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

namespace _6_v3
{
    class Program
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int m = int.Parse(Console.ReadLine());
            char c = 'a';
            switch (m)
            {
                case 1:
                    c = 'a';
                    break;
                case 2:
                    c = 'b';
                    break;
                case 3:
                    c = 'c';
                    break;
                case 4:
                    c = 'd';
                    break;
                case 5:
                    c = 'e';
                    break;
                case 6:
                    c = 'f';
                    break;
                case 7:
                    c = 'g';
                    break;
                case 8:
                    c = 'h';
                    break;
                case 9:
                    c = 'i';
                    break;
                default:
                    break;
            }
            for (int a = 1; a <= n; a++)
            {
                for (int s = 1; s <= n; s++)
                {
                    for (char i = 'a'; i <= c; i++)
                    {
                        for (char q = 'a'; q <= c; q++)
                        {
                            for (int w = 1; w <= n; w++)
                            {
                                Console.Write($"{a}{s}{i}{q}{w} ");
                            }
                        }
                    }
                }
            }
        }
    }
}