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.
Q: Poster: Share Dean's latest newsletter, which covers all things INNOCENCE!  Responser: I bought the audio book tonight!!!!!
A: 
Positive