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: Couldn't be more excited and honored to be asked to do Arthur Ashe Kids Day today at the U.S. Open! Thanks for having me guys!!  Responser: Just watched you play at the U.S. open you looked so great!
