Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sell!!

As a professional Day Trader and a former Fund Manager I'll let you in on a little secret. Anyone who has a system that works will never tell you how it works until they are retired or no longer using it. It's like giving money away. If any of you have read the Market Wizard books, you will notice a common thread in the interviews with each trader - none of them will tell you exactly how to do it. Just like I would never tell anyone how I make money because if I did it may not work any more.