Instruct: Classify the given review into positive or negative sentiment.
Query: Buying this book is WASTING money.

This book is not worth buying for the following reasons:1) The book fails to explain the concepts clearly.2) It is rather confusing and boring; the chapters on important concepts are not clearly laid out. It seems the author hasn't given sufficient thoughts to come up with a better work.3) The book is full of grammatical mistakes.4) It total, it is complete waste of money in my view. There are many other good ones out there in the market on Software Engineering.Thanks,A Software Professional