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: Rosa will be unveiling this year's submissions to the Congressional Art Competition this Saturday at Gateway Community College. The pieces will be on display until 5/14.  Responser: what are the requirements for this contest?
