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: These bars are just the right balance between the flavor of the coconut & the sweetness of the rice syrup. Unfortunately, although the expiration date is in 2013, about a third of mine went bad, or perhaps started life that way. They had a funny, metallic taste, & one even had some black substance on it, which may or may not have been mold. I'm wondering if refrigerating would have prevented this. I highly recommend these bars, but beware of the keeping quality!
Example Output: 3

Example Input: These taste wonderful! Guilt free if you can stop at one bag. Will definitly buy again!
Example Output: 5

Example Input: Try this you might like it. I did and I am quite addicted, it is too easy to prepare, it tastes great and it absorbs the flavors you cook it with. The price is really good and well worth the purchase. If you like this type of Couscous like I do, then give this one a try.It can be eaten hot, room temp or in a cold salad with a variety of greens and other flavors, it takes on the other flavors very well when mixed. I cooked the Couscous with a broth and oilive oil for added flavor and it rocked my taste buds big time. I will be back for more.
Example Output:
5