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: Having fun here in Perth at the Hopman Cup - Australian Open Series and had a great time filming this piece for Trans World Sport at IMG Academy in December. https://www.youtube.com/watch?v=PsebmNDAnho  Responser: Wonderful video! Looking forward to watching you soar to the top! Future #1!
