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: Thanks, The Stranger, for the most thoughtful and explorative writeup I've had this year.  Responser: That's a great article! I'm writing my amazon review sometime this week, now that I've finished the book. ... It will certainly give praise, but probably not as well written as this Stranger article. I will do my best. :)
