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: So I heard @RRRawlings @gasmonkeygarage stopped by the @feslernation booth to check out my custom '66 #mustang #fastback @barrett_jackson  Responser: Hit Barrett-Jackson Saturday. So many great cars. Got to do laps with the pro driver in the new Mustang, Dodge Viper, and did a short drag in the new Dodge Hellcat. Good times.
