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: Check out this beautiful People.com ad for INNOCENCE, now on stands!  Responser: Picked mine up at Target and realized it is an autographed copy by Dean Koontz himself. What a magnificent surprise!!!!
