using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter your username");

        string un = Console.ReadLine();

        Console.WriteLine("Please enter your password");

        string pw = Console.ReadLine();

        if (un == "abcd" && pw == "1234") {

            Console.WriteLine("Successful Login!");

        }

        else if (un != "abcd" && pw != "1234"){

            Console.WriteLine("Wrong username and password!");

        }

        else if (un != "abcd") {

            Console.WriteLine("Wrong username!");

        }

        else if (pw != "1234"){

            Console.WriteLine("Wrong Password!");

        }

        else {

            Console.WriteLine("Error! Failed Login!");

        }

    }

}