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: Excited to be a part of this incredible cast! Greenleaf redefines drama. See you in June on OWN!  Responser: Congrats!..cant wait to see it!
