Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: i would like 2 books and 1 ball and 1 hat  YOU: give me all the hats and you could keep the books and ball  THEM: you can not share 1 hat with me?  YOU: if you give me one book then i can give you one hat  THEM: no deal, i will keep books and ball  YOU: okay then i will keep the hats!
Output:
Yes