In this task, you are given reviews written about the books in Bengali. You are expected to classify the sentiment of the reviews into two classes: positive or negative.

Let me give you an example: অসাধারণ একটি বই, লজিকাল স্কিল ডেভেলপমেন্ট এর জন্যে অতুলনীয়..
The answer to this example can be: positive
Here is why: Here the reviewer seems to love the logical development of the storyline in the book, so this should be classified as positive.

OK. solve this:
খুব রহস্যময় একটি বই । আমার অনেক ভালো লাগলো এই বই । আমার Rating 4.5 out of 5
Answer:
positive