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: Are you reading DEEPLY ODD this weekend? The paperback is a perfect traveling companion!  Responser: Not that far into the series just yet. Only just finished 'Odd Hours'.
