I'm taking this quiz and there is this one question that has a blank box and then it says is the main idea or meaning of literary work and this question is not multiple choice question can you

moon-letters were a method of writing invented by the dwarves. moon-letters were ordinary runes, but written in such a way that they could only be read when the light of the moon shone behind the writing. some moon-letters could be read by any moonlight, but it was possible to make the writing even more secret. more sophisticated moon-letters could only be read by the light of the same shape of moon, or at the same time of year, as when they were written. hope this !

go to google if u want the answer