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: Incredible video. Nobody was injured. The rocket was unmanned.  Responser: Yes (Teresa) I watched online yesterday as the launch was postponed. Sorry that the Space Station won't be getting those supplies on schedule. Glad no one was injured.
