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: My time with the great #AlPacino. Can't wait to show YOU what he showed me. An American treasure tonight on Nightline.  Responser: Very nice, my friend!
