You will be given a definition of a task first, then some input of the task.
In this task, you are given books product reviews in English language. The goal is to classify the review as "POS" if the overall sentiment of the review is positive or as "NEG" if the overall sentiment of the review is negative.

Eye opener! . I have been an Investment Counselor for over 40 years. This book makes more common sense than any book I have read on the subject. My main regret is that is wasn't around earlier. It is the key to Wealth and Security.
Output:
POS