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: THANK YOU for helping meet our year-end goal. Have a happy and safe New Year's -- and let's win in 2010!  Responser: Happy New Year to you Sean and your family too!
