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: Good Morning! Back from vacation and back at work this AM. Are you ready for the week? News starts in 5 minutes.  Responser: Good morning L.D....welcome back...
