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: If I were a #mailbox I'd want to live in the #desert -- #rust #romance & the #uspo https://t.co/K1bnC4iJfj  Responser: Imagine the conversations they must have
