private function askForSpecificResources(InputInterface $input, OutputInterface $output) {
        $resources = Resource::getAllResources();
        sort($resources);

        $question = new ChoiceQuestion(
            'Which resources should the public key have access to? (comma-separated) ',
            $resources
        );
        $question->setMultiselect(true);

        return $this->getHelper('question')->ask($input, $output, $question);
    }