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: I'm exhausted and stressed out after watching this Sharapova/ Williams match... That was the BEST match I've watched in a loooong time!  Responser: Happy Easter Kris...
