using System;

public class Program

{

    public static void Main()

    {

        //Question 1

        string strItemCode = "sony-dvd-062019";

        // splits the string into an array with 3 elements, we split it by dashes

        string[] arrDashSplit = strItemCode.Split('-');

        // index 0 is the manufacturer

        string strManufacturer = arrDashSplit[0];

        // index 1 is the product

        string strProduct = arrDashSplit[1];

        // index 2 is the date, which then needs the first 2 characters as month

        string strMonth = arrDashSplit[2].Substring(0,2);

        // the rest of the characters make the year

        string strYear = arrDashSplit[2].Substring(2);

        Console.WriteLine("Manufacturer: " + strManufacturer);

        Console.WriteLine("Product: " + strProduct);

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

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

        // Question 2

        // get user input

        Console.Write("Email address: ");

        string strEmail = Console.ReadLine();

        if(strEmail.Contains("@")){

            // gets index of the @

            int atLoc = strEmail.IndexOf("@");

            // gets the characters up until the @, which constitutes a username

            Console.WriteLine("username: " + strEmail.Substring(0, atLoc));

            // gets the characters following the @ which constitutes a domain

            Console.WriteLine("domain: " + strEmail.Substring(atLoc + 1));

        }

        else{ 

            // prints error message if no @ exists

            Console.WriteLine("Error: Your email address is not valid! Ending program..."); 

        }

    }

}