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: Sorry I've been boring lately and haven't posted anything! I've been so busy getting ready for Europe and then traveling. But I'm in Madrid now so I will be much better about posting :)  Responser: you doing all the work. we love the results!
