StupidPasswordGenerator

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

namespace StupidPasswords
{
    public class Program
    {
        public static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int l = int.Parse(Console.ReadLine());

            // For each position [1...5]
            for (int i1 = 1; i1 < n; i1++)
            {
                for (int i2 = 1; i2 < n; i2++)
                {
                    int firstSymbol = i1;
                    int secondSymbol = i2;
                    for (int i3 = 0; i3 < l; i3++)
                    {
                        for (int i4 = 0; i4 < l; i4++)
                        {
                            // The last symbol should starts with a number bigger with 1 than the biggest number from the first two.
                            int max = firstSymbol > secondSymbol ? firstSymbol : secondSymbol;
                            for (int i5 = max + 1; i5 <= n; i5++)
                            {
                                // Ascii code for 'a'
                                int aCharCode = 97;

                                // Get the next ascii code, e.i. 
                                char thirdSymbol = (char)(aCharCode + i3);
                                char fourthSymbol = (char)(aCharCode + i4);

                                int fifthSybmbol = i5;

                                string output = $"{firstSymbol}{secondSymbol}{thirdSymbol}{fourthSymbol}{fifthSybmbol}";
                                Console.Write(output);
                                Console.Write(" ");
                            }
                        }
                    }
                }
            }
        }
    }
}