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: Who's coming to the screening of LINES in Carmel Ca. on the 19th!? I am!! ;-)  Responser: I hope I can! I would love to meet you!
