Instruction: Analyze the query and each product title. Sort the products in descending order based on their relevance to the query. The most relevant product should be at the top of the list, and output the ranked list.

Input:
Query: power roller backpack
Product list:
A: Oreck Commercial Upright Vacuum Cleaner, Bagged Professional Pro Grade Lightweight, 9 Pounds 40-Foot Long Cord, U2000R-1, Gray/Red
B: Aoking Large Capacity Waterproof 18" Laptop Trolley Backpack with USB Charing Port Fashion Rolling Luggage for Business Office Travel College
Answer: B,A