In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Example Input: Unfortunately they didn't work for me at all for they doesn't work with soft tissue. My skin tissue is too soft and it won't stay in place. So be careful unfortunately it won't work for everyone. The firmer your skin is the better it may work.
Example Output: negative

Example Input: My 3 year old loves this piano! It is so fun and the microphone is a great bonus! Lots of musical options to use when playing with this adorable piano!
Example Output: positive

Example Input: This is a nice carseat. It will be the last car seat I will need to get for my grandson as it is adjustable so it can also convert to a booster seat. Very nicely made and sturdy. Love it.
Example Output:
positive