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: A tough first set but I'm happy to get a win on clay...and keep improving!  Responser: Good Job Lady!!! Keep striving!
