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: Like in many cities in America, tensions between people and the police have been brewing in my hometown of Baltimore. But here, it is more complicated than just race.  Responser: https://www.facebook.com/winningateverything/photos/a.115511545191454.20134.115346608541281/654566051285998/?type=1
