I hate to say this- well, actually I love to say this to show how smart I am- but the letter H is usually spelled aitch and R is usually spelled ar, so there really are multiple answers.
They are indeed, which is why those already work as type-ins. If you wanted to show how really smart you were, you'd try out your alternate answers first to see if they worked, rather than posting messages on the untested assumption that they didn't :)
Yes, we've allowed several spellings of the answer. Sorry that our xenonumerophobia has gotten in the way of offering a fuller selection of alternates.