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: Tinderbox fest tonight, music hall of wburg 9pm with Deerhoof, Elizabeth the catapult and more. Come see me!!!!  Responser: I'm coming! But I want a pic of you stealing my iPad after, k?
