using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Book options");

        Console.WriteLine("options: c=computer books m=math books h=history books e=english books");

        Console.WriteLine("Please enter your option: ");

        var option = Console.ReadLine();

        if(option=="c") 

        {Console.Write("computer books"); 

        Console.Read();}

        else if(option=="m") 

        {Console.Write("math books"); 

        Console.Read();}

        else if(option=="h") 

        {Console.Write("history books");

        Console.Read();}

        else if(option=="e") 

        {Console.Write("english books");

        Console.Read();}

        else{Console.WriteLine("wrong value");goto myLable;}

            myLable: Console.WriteLine("try again"); 

    }

}