using System;

public class Program

{

    public static void Main()

    {

        Program P=new Program();

        P.authenticate("AQA","GCSE123");

    }

    public void authenticate(string user,string pass)

    {

        string[]us={"dave", "alice", "bob"};

        string[]ps={"abf32", "woof2006", "!@34E$"};

        int z=0;

        int correct =0;

        while(z<3)

        {

            if(user==us[z])

            {

                if(pass==ps[z])

                {

                    correct = 1;

                    break;

                }

            }

            z=z+1;

        }

        if(correct==1)

        {

            Console.WriteLine("Username and password is correct.");

        }

        else

        {

            Console.WriteLine("Username and password is incorrect.");

        }

    }

}