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: We had to pull out of doubles here in Madrid today because poor Polona is hurt. Hope she recovers soon...we can all empathize with her. Getting ready for Rome now and back to the red clay!  Responser: good luck and hope the best for Polona
