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: Won again today!! 6-2,6-3! Into the quarterfinals tomorrow against Kaia Kanepi! My first time competing against someone top 50  Responser: I knew u could do it
