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: My first match at Brisbane International is against my good friend Serena Williams! We are third on in the Pat Rafter Arena and the first match is at 11:30am December 30 (8:30pm on December 29 EST). Show your support by leaving encouraging comments!  Responser: I absolutely will be rooting for you.
