using System;

public class Program

{

    public static void Main()

    {

        string randomNumber = GenerateRandomNumber();

        Console.WriteLine(randomNumber);

        string randomLetters = GenerateRandomLetters();

        Console.WriteLine(randomLetters);

    }

      public static string GenerateRandomNumber()

    {

        DateTime now = DateTime.Now;

        long ticks = now.Ticks;

        // Get the last 4 digits from the ticks

        string lastFourDigits = (ticks % 10000).ToString("D4");

​

        return lastFourDigits;

    }

    public static string GenerateRandomLetters()

    {

        DateTime now = DateTime.Now;

        long ticks = now.Ticks;

​

        // Get the last 2 digits from the ticks

        int lastTwoDigits = (int)(ticks % 100);

​

        // Map the range of 0-99 to A-Z

        char randomLetter1 = (char)('A' + lastTwoDigits / 26);

        char randomLetter2 = (char)('A' + lastTwoDigits % 26);

​

        return string.Concat(randomLetter1, randomLetter2);

    }

}