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: Mans best friend and Man. Both have surgery on the same knee within days of each other. Can't make this stuff up. PIX 11  Responser: Get well some wished to both of you
