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: LONDON LONDON LONDON LONDON LONDON!!!!!! So excited to head to London tomorrow for our @thegivingkeys Ace Hotel event, as well as the Pure Trade Show. Friends, let your cool UK friends know about this & have them Rsvp to the email on this posted flier. Xoxo  Responser: Liz Simmons Charlotte McDonnell
