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: Remember Georgie's Aunt Crystal from Season 8, episode 8 of "Heartland"? Aunt Crystal really hurt Georgie but Keegan Connor Tracy who played Crystal was actually a lot of fun on set!  Responser: I will always see Keegan as the blue fairy on Once Upon a Time even though she played the mean aunt...lol
