execute

$term1 = rand(1, 10);
$term2 = rand(1, 10);
$result = $term1 + $term2;

$io = new SymfonyStyle($input, $output);

$answer = (int) $io->ask(sprintf('What is %s + %s?', $term1, $term2));

if ($answer === $result) {
    $io->success('Well done!');
} else {
    $io->error(sprintf('Aww, so close. The answer was %s', $result));
}

if ($io->confirm('Play again?')) {
    return $this->execute($input, $output);
}

return Command::SUCCESS;