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: John and partner Sam Querrey defeated Ball / Hanley 5-7, 6-4, 10-8 to advance in the ARAG Team Championship  Responser: YEA!!!!! good job!!! *cheer cheer*
