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: Imagine, teachers reading my book.... I'd Like To Apologize to Every Teacher I Ever Had just made the NY Times Best Sellers List. Thanks! Love, Tony  Responser: Congrats, Tony! You rate an A+ with this teacher.
