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: There is no bigger honor than to represent your country! Go USA! https://www.facebook.com/USTA/posts/10152685609612058:0  Responser: Good luck! We are proud of you!
