I made a change in the way I pick my steps and it finally worked, haha!

I was about to give up and go to sleep, but it's your comment that gave me hope for a last try. ^_^

I tried these stacked cases but I got undefined on my attempts, I don't know why for now... But I wanna say that you could put a default case for when the user gives you an invalid month so your switch can return an error message. ^^