Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: Want a signed copy but can't make it to any of my signings because your bed is so, so comfortable? This may be your answer.  Responser: I would love a signed book so can you come over to Manchester in the UK please
