StupidPasswordGenerator

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

namespace StupidPasswordGenerator
{
    class StupidPasswordGenerator
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int L = int.Parse(Console.ReadLine());

            for (int firstNum = 1; firstNum < n; firstNum++)
            {
                for (int secondNum = 1; secondNum < n; secondNum++)
                {
                    for (char firstLetter = 'a'; firstLetter < 'a' + L; firstLetter++)
                    {
                        for (char secondLetter = 'a'; secondLetter < 'a' + L; secondLetter++)
                        {
                            for (int lastNum = Math.Max(firstNum, secondNum) + 1; lastNum <= n; lastNum++)
                            {
                                Console.Write($"{firstNum}{secondNum}{firstLetter}{secondLetter}{lastNum} ");
                            }
                        }
                    }
                }
            }
        }
    }
}