using System;

using System.Text.RegularExpressions;

using System.IO;

using System.Text;

public class Program

{

    public static void Main()

    {

        string text = "1234";

        // Use input string to calculate MD5 hash

        using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())

        {

            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(text);

            byte[] hashBytes = md5.ComputeHash(inputBytes);

​

            // Convert the byte array to hexadecimal string

            StringBuilder sb = new StringBuilder();

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

            {

                sb.Append(hashBytes[i].ToString("X2"));

            }

            Console.WriteLine(sb.ToString().ToLower());

        }

    }

}