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: This is where I slept overnight. An eye-opening experience. #FeelGoodFriday WATCH the Good Morning America story here: http://abcnews.go.com/GMA/video/sleep-nyc-streets-raise-awareness-homeless-youth-26422708  Responser: Thanks for bringing the story to us
