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: Our infrastructure, once the envy of the world, is wearing out. Reforms and investments are needed to get back on track.  Responser: yes please... cannot believe we are not investing in our infrastructure, the best investment we could make at this time...
