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: William Street Mail Processing Facility to Remain Open  Responser: Excellent work Congressman Higgins! Thank you for standing up and leading the charge on behalf of all of Western New York.

Positive