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: A year ago I competed at the #Olympics !! Pretty cool haha! :D @TeamGB #Olympian  Responser: Thank goodness! The rest of FB seems to be gushing this morning.
