using System;

public class Program

{

    public static void Main()

    {

        string user,pass;

        Console.Write("Username :");

        user = Console.ReadLine();

        Console.Write("Password :");

        pass = Console.ReadLine();

        if(user!="admin" && pass!="a12345")

        {

            Console.Write("Username or password invalid! ! !");

        }

        else if(user!="admin")

        {

            Console.Write("Username invalid! ! !");

        }

        else if(pass!="a12345")

        {

            Console.Write("Password invalid! ! !");

        }

        else 

        {

            Console.Write("Welcome! ! ! admin");

        }

    }

}