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: Lost a tough one 7-6, 6-3. Really happy with the way I played though! Had a lot of opportunities and fought well. Such a good experience this week, keep your fingers crossed that I get in doubles and mixed doubles!  Responser: Score showed you really fought. Yes, good luck on doubles and mixed.
