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: FINALS!!!!!!!!!!!! Come on!!!! Beat Errani today 7-6(12), 6-3!!! What a week! One more to go! This is incredible! I'm so so so happy :) Thanks for all the support from you guys!  Responser: Wow!!! Shelby, so awesome! You go girl! So proud of you!
