Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: mobile water purifier
Product list:
A: COSTWAY Air Cooler and Heater, Compact Portable Evaporative Cooler
B: WSTA Portable Ozone Generator,Multipurpose Ozone Machine with Timer for Home,Room,Office,Hunting
Answer: B,A