using System;

using System.Text;  

using System.Security.Cryptography;  

​

public class Program

{

    public static void Main()

    {

        string str1 = "SFYyMHtyMz4zcnMzXzNuZzFuMzNyMW5ne2";

        string str3 = "SFYyMHtyMz4zcnMzXzNuZzFuMzNyMW5nd2";

        string str2 = "00ZDNfMzRzeX0=";

        string s = "Q1RGX3hsNHoxbmnf";

        byte[] array4 = Convert.FromBase64String(str1 + str2);

                byte[] array5 = Convert.FromBase64String(s);

                byte[] array6 = new byte[array4.Length];

                byte[] array7 = SHA1.Create().ComputeHash(array6);

        Console.WriteLine(Encoding.ASCII.GetString(array4));

        array4 = Convert.FromBase64String(str3 + str2);

        Console.WriteLine(Encoding.ASCII.GetString(array4));

        char c = 'f';

        Console.WriteLine(c.GetHashCode()%10);

    }

}