using System;
public class Exercise16
{
    public static void Main()
    {
        string username, password;
        int ctr = 0;
        Console.Write("\n\nCheck username and password :\n");
        Console.Write("N.B. : Default user name and password is :abcd and 1234\n");
        Console.Write("------------------------------------------------------\n");
        do
            {
                Console.Write("Input a username: ");
                username = Console.ReadLine();
                Console.Write("Input a password: ");
                password = Console.ReadLine();
                if(username != "abcd" || password != "1234")
                    ctr++;
                else
                    ctr=1;
            }
        while((username != "abcd" || password != "1234")  && (ctr != 3));
        if (ctr == 3)
            Console.Write("\nLogin attemp three or more times. Try later!\n\n");
        else
            Console.Write("\nThe password entered successfully!\n\n");
    }
}