Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: i'd like books. you can have the rest.  YOU: the orphanage i work at could use at least 1 book to read  THEM: then i'll take 1 ball and 2 books.  YOU: no i think the kids need exercise more than reading. i will take the balls and the hat. you keep the books.
Output:
Yes