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: The choreography and dancing on #sytycd @DANCEonFOX is so completely off the charts amazing. I love it!  Responser: Imagine them doing a routine to a She & Him song :)
