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: Varvara upsets Schiavone 36 63 86 to reach 4R of Major for the 1st time !!!! what a match, what a battle !!! IMPRESSIVE, just IMPRESSIVE !!!! next up Petra Kvitova...  Responser: Yaaa Varv . Great job
