Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Will Sorenson:  How about you Castle , you 've written what ... 20 bestsellers ?
Richard Castle: _ 26 _ but who 's counting ?
Will Sorenson: Why the sudden need to shadow a real detective ?
Richard Castle: Well , the ones on TV seem oddly fixated on their sunglasses .

bestsellers