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: Monica & I plotting out the tactics that won our match in a nail-biter!!  Responser: Deciding on which one was going to play serve & volley to shock the other team!!
