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: Winston--who's half-Boxer--can still land a punch even when he's flat on his back. One of his favorite playtime activities! #WinstonWednesday  Responser: Oh, he looks so cute here !
