You will be given a definition of a task first, then some input of the task.
In this task, you're given a review from Amazon. Your task is to generate a rating for the product on a scale of 1-5 based on the review. The rating means 1: extremely poor, 2: poor, 3: neutral, 4: good, 5: extremely good.

A good glimpse into the roots of rock and roll, and the excesses of the culture. Rock n' rollers are egotistical by nature, but in spite of that, it's still an interesting read. I look forward to Stephen Stills' autobiography to get another perspective.
Output:
3