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: I'm going Live at 5:45PST (8:45EST) ON INSTAGRAM tonight to celebrate 100k followers on Instagram. Come hang out! instagram.com/p/BS7EhVJguCE/  Responser: Congratulations on 100,000 !!!
