Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One of my all-time favorites!

I have read hundreds of sci-fi books in my life - nothing like this one! I must reiterate - you will never read anything like this again! The most original sci-fi ever written, and if you combine this with light, humorous satire at the soviet reality, disguised as a phantasy - you get one of the most enchanting sci-fi stories ever. It helps if you are familiar with the Russian folklore and culture, but don't be taken aback if you are not! Another thing, I first read this book when I was 10, and re-read it maybe 20 times since then - it only gets better with time!