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: Rail section going down in about 2 hours - here's a sneaky peek from practise yesterday :) www.dewtour.com Dew Tour @jon_moy  Responser: You still killed it dude!
