public static void main(String []args) {
        MessageProcessor processor = Util.createMessageProcessor();
        MessageArchiver archiver = Util.createMessageArchiver();
        List<Message> messages = new ArrayList<>();
        for (int i = 0; i < Util.EXPECTED_TOTAL; i++) {
            Message msg = Util.random();
            processor.processMessage(msg);
            messages.add(msg);
        }

        archiver.archiveMessages(messages, m -> m.getSubject().startsWith("A"));

        /*
         *  DO NOT CHANGE ANYTHING BELOW THIS LINE.
         *  PROGRAM MUST EXIT SUCCESSFULLY
         */
        Util.validate();
    }