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: #TBT: With Caity in 1988 and with Hailey in 2015.  Responser: She's going to be a pianist - look at those fingers!
