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: I thought the impeller was broken so I purchased a new one and unfortunately learned that it is the filter itself that is no longer able to pump water. I bought this a month ago. My turtles are not happy.
Example Output: negative

Example Input: grandfather thought he would like the open to but says they tend to roll up on him and become uncomfortable so be sure to try closed toe first. the quality was fine just a personal comfort issue.
Example Output: positive

Example Input: Interesting guide about python programming. All what you need to know about this program, in this book. All information described in detail special for beginners. I advice this book to all.
Example Output:
positive