using System;

public class Program

{

    public static void Main()

    {

        //1

        string strItemCode = "sony-dvd-062019";

        string[] myEntry;

        myEntry = strItemCode.Split('-');

        string strDate = myEntry[2];

        int intstartIndex = 2;

        int intlength = 4;

        string strYear = strDate.Substring(intstartIndex, intlength);

        int intstartIndexM = 0;

        int intlengthM = 2;

        string strMonth = strDate.Substring(intstartIndexM, intlengthM);

        Console.WriteLine("Manufacturer: " + myEntry[0]);

        Console.WriteLine("Product: " + myEntry[1]);

        Console.WriteLine("Month: " + strMonth);

        Console.WriteLine("Year: " + strYear);

        //2

        Console.WriteLine("Enter an email address: ");

        string stremailaddress = Console.ReadLine();

        int intStringSize = stremailaddress.Length;

        int intRule = intStringSize - 1;

        int intAtSign = stremailaddress.IndexOf("@");

        if (intAtSign <= 0 || stremailaddress.EndsWith("@"))

        {

            Console.WriteLine("This is not a valid email address. Enter a valid email!");

        }

        else

        {

            int intstartIndexU = 0;

            int intlengthU = (intAtSign);

            string strUsername = stremailaddress.Substring(intstartIndexU, intlengthU);

            int intstartIndexD = (intAtSign + 1);

            int intlengthD = (intStringSize - intstartIndexD);

            string strDomain = stremailaddress.Substring(intstartIndexD, intlengthD);

            Console.WriteLine("Username: " + strUsername);

            Console.WriteLine("Domain: " + strDomain);

        }

    }

}