public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);

        System.out.println("Type your username: ");
            String username = reader.nextLine();

        System.out.println("Type your password: ");
            String password = reader.nextLine();


        if(username.equals("alex") || username.equals("emily") && password.equals("mightyducks") || password.equals("cat")) {
            System.out.println("You are now logged into the system!");
        }
        else{
            System.out.println("Your username or password vas invalid!");
        }
    }
}