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: LOS ANGELES: come to Lot 1 Cafe tonight 7-10 for an informal meetup/signing and a very special giveaway. http://isaacmarion.com/events/2016/10/19/lameetup  Responser: Lot 1 was mysteriously closed so I moved to Tierra Mia Coffee. I'll be here till 9.
