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: For those in New York City, you can get the latest updates on Hurricane Irene at the NYC Office of Emergency Management's Facebook page. Please stay safe, everyone!  Responser: Thank you. You stay safe also
