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: I WONNNNNN!!!!! 6-2, 5-7, 7-6(4) US OPEN BABYYYY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Love y'all!!!!  Responser: Way to go Shelby!! Been thinking of you all afternoon. So happy for you!! New York bound now........FANTASTIC
