In this task, you're given a review from Amazon's food products. 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 or mixed, 4: good, 5: extremely good. 

Example Input: The candy arrived with some white waxy stuff on it; almost as if it had partially melted at one point.  Tasted chalky.  Not interested in a partial refund.  Next time find a way to make sure candy is not stale.
Example Output: 2

Example Input: In my office, and for me personally, this is the smoothest and best tasting coffee you can buy for your Keurig machine. Great price too!
Example Output: 5

Example Input: This is really a great product.  Works and tastes just like the gluten product.  Our son is a celiac and we have tried a lot of products.  We rate this "crossover" brand one of the best.
Example Output:
5