using System;

using System.Globalization;

using System.Numerics;

using System.Text;

​

class Program

{

    private const string Base36Chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    static void Main()

    {

        var guid = "b5ac92a0-1bcf-4e5d-8075-968070aac768";

        // Remove the dashes

        var replaced = guid.Replace("-", "");

​

        // Ensure that replaced string has exactly 32 characters (it should)

        if (replaced.Length != 32)

        {

            Console.WriteLine("Error: The GUID string is not valid after removing dashes.");

            return;

        }

​

        // Split into two parts

        var mainPart = replaced[..20];

        var secondary = replaced[20..];

        mainPart = "0" + mainPart;

        secondary = "0" + secondary;

​

        // Print the parts for debugging

        Console.WriteLine($"Main Part: {mainPart}");

        Console.WriteLine($"Secondary Part: {secondary}");

​

        // Parse the parts into BigIntegers

        try

        {

            // Use TryParse to check for parsing issues

            if (BigInteger.TryParse(mainPart, NumberStyles.HexNumber, null, out BigInteger mainBigInt) && 

                BigInteger.TryParse(secondary, NumberStyles.HexNumber, null, out BigInteger secondaryBigInt))

            {

                // Calculate the sum

                var sum = mainBigInt + secondaryBigInt;

                Console.WriteLine(mainBigInt);

                Console.WriteLine(secondaryBigInt);

                Console.WriteLine(sum);

                Console.WriteLine();

                var base36 = ToBase36(sum);

                Console.WriteLine(ToBase36(mainBigInt));

                Console.WriteLine(ToBase36(secondaryBigInt));

                Console.WriteLine(base36);

            }

            else

            {

                Console.WriteLine("Error: Failed to parse one or both of the BigInteger parts.");

            }

        }

        catch (FormatException e)

        {

            Console.WriteLine("Error parsing one of the parts as BigInteger: " + e.Message);

        }

    }

    public static string ToBase36(BigInteger value)

    {

        // Handle the special case where the value is 0

        if (value == 0)

            return "0";

​

        StringBuilder result = new StringBuilder();

​

        // While the value is greater than 0, divide by 36 and prepend the corresponding character

        while (value > 0)

        {

            int remainder = (int)(value % 36);

            result.Insert(0, Base36Chars[remainder]);  // Insert the character at the start of the StringBuilder

            value /= 36;

        }

​

        return result.ToString();

    }

}

​