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: Working hard at IMG Academy in some Florida heat getting ready for the US Open Tennis Championships. Can't wait to be back in New York City!  Responser: Good to know you will back on US OPEN. God bless you
