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: Hi Facebook friends, I will be anchoring Nightline tonight. We have a great show, including my interview with psychic/medium Kim Russo from the Lifetime show 'The Haunting of...' See you tonight at 12:35AM ET  Responser: Wish we had known! I'm sure you were great!
