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: Good Morning! Coming to you from #Revelation2014! We've just begun morning activities! Are you live streaming??!  Responser: Thank u,how do i join?

Neutral