protected function execute(InputInterface $input, OutputInterface $output)
    {
        $helper = $this->getHelper('question');
        $question = new ChoiceQuestion(
            'Please select your favorite color (defaults to red)',
            [],
            0
        );
        
        $question->setErrorMessage('Color %s is invalid.');

        $color = $helper->ask($input, $output, $question);
        $output->writeln('You have just selected: '.$color);

    }