protected function simpleArg($key, $desc = '')
    {
        if ($this->isOption($key)) {
            $name = substr($key, 0, -1);
            $this->addArgument($name, InputArgument::OPTIONAL, $desc);
            $this->addArgumentInput($name, InputArgument::OPTIONAL, $desc);
        } else {
            $this->addArgument($key, InputArgument::REQUIRED, $desc);
            $this->addArgumentInput($key, InputArgument::REQUIRED, $desc);
        }
    }