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: Robin:  Listen : how many sides is a circle ? Answer : _ two _ . Inside and outside , right ?
Batman: Right .
Robin: Here 's the second one : what President of the United States wore the biggest hat ? It 's , it 's easy Batman : the one with the biggest head !
Batman: Of course .

sides