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: All orders of The Hungry Mouth placed after February 8 were shipped today. Sorry for the slowness, guys; it's a back-alley operation I'm running.  Responser: Do you still have some copies left?
