using System;

using System.Linq;

​

public class HexCalculator

{

    public static string CompareOddEvenHexDigits(string hexNumber)

    {

        if (string.IsNullOrEmpty(hexNumber))

        {

            return "same odds and evens"; // Or throw an exception, depending on desired behavior

        }

​

        hexNumber = hexNumber.ToUpper();

​

        int sumOdd = 0;

        int sumEven = 0;

​

        for (int i = 0; i < hexNumber.Length; i++)

        {

            int digitValue;

            try

            {

                digitValue = Convert.ToInt32(hexNumber[i].ToString(), 16);

            }

            catch (FormatException)

            {

                return "Invalid Hexadecimal Input"; // Handle invalid characters

            }

​

            if (i % 2 == 0) // Even index, odd position

            {

                sumOdd += digitValue;

            }

            else // Odd index, even position

            {

                sumEven += digitValue;

            }

        }

​

        int difference = sumOdd - sumEven;

​

        if (difference > 0)

        {

            return "greater odds";

        }

        else if (difference < 0)

        {

            return "lesser odds";

        }

        else

        {

            return "same odds and evens";

        }

    }

​

    public static void Main(string[] args)

    {

        Console.WriteLine("Enter a hexadecimal number:");

        string hexInput = Console.ReadLine();

​

        string result = CompareOddEvenHexDigits(hexInput);

        Console.WriteLine(result);

    }

}