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: Crazy! Season 9 of Heartland on CBC is almost done!! So much happens in the last 4 episodes - you definitely won't want to miss!  Responser: I love Heartland. Very sad that it is not showing in the US.
