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 Shooting Red Dwarf for the @BBC sometime in the late 1980s. Well before rehab.  Responser: An amazing cross between Don Ho, Connor McLeod, and Al Pacino.
