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: Today I donated books from the Library of Congress to the Douglas Public Library, where we enjoyed a few minutes of story time. We read, "How to Catch a Star," by Oliver Jeffers.  Responser: Now that is cool ! Well done !
