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: Tonight I enjoyed the opening ceremony of the Delaware Chinese Festival happening through this weekend in Hockessin!  Responser: NAVIENT BANK LIES CHEATS AND COMMITS FRAUD! I HAVE AUDIO PROOF OF THEIR DECEPTION!
