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. 

Ex Input:
This is a great product, we have made custard with it for years and it always makes great custard. We will purchase this product again. Amazon does a great job of getting us our purchases fast and without damage.

Ex Output:
5


Ex Input:
We've only used this once, but it kept us awake most of the night.  We were surprised because it's decaf, but we couldn't sleep for hours after going to bed.  Tastes good, though.

Ex Output:
3


Ex Input:
Add walnuts to this healthful Brownie and perhaps a light iceing.  Do not overback or it will be very dry.  Lots of good stuff in this Brownie,  but the flax taste is a little strong.  I really feel no guilt when having a Brownie snack for me or my kids.

Ex Output:

5