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: Heads up: my #AZ office is only hosting the supply drive for the Filipino Typhoon Victims for one more day. Bring by your donations today!  Responser: Already donated to Samaritan's Purse. Thanks, David!
