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: Our new @CNBC digital series -- about the movie/TV biz -- announced today! https://www.youtube.com/watch?v=CimAHpg6i_M  Responser: I'm sure it will be great!
