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: Guys if you have anytime to spare check out my friend Matt McCoy's page igg.me/at/Boston-Mara. He's running in the Boston marathon! Any donation would be amazing!  Responser: Here's the correct link: https://www.indiegogo.com/projects/running-for-a-reason--3#/
