using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    static char[] FirstChars = new [] { 'a', 'A','u', 'U'} ; 

    public static void Main()

    {

        foreach (var firstChar in FirstChars) 

        {

            for (var numbers = 5; numbers <= 7; numbers++) 

            {

                for (var number = 0; number < Math.Pow(10, numbers); number++) 

                {

                    var input = firstChar.ToString() + number.ToString("D" + numbers);

                    var provider = new MD5CryptoServiceProvider();

                    var bytes = provider.ComputeHash(new UTF8Encoding().GetBytes(input));

                    Console.WriteLine(BitConverter.ToString(bytes) + "\t" + input);

                } 

            }

        } 

    }

}