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: Why am I dressed like a utility worker? We're conducting an important safety experiment. Join us for it Thursday on Good Morning America.  Responser: You're missing the policeman, Indian, cowboy...
