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: Congratulations Seahawks! On to the Super Bowl!  Responser: https://www.facebook.com/photo.php?fbid=10152062965410914&set=a.82108390913.80726.51560645913&type=1&theater
