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: boys school backpack
Product list:
A: PUMA Kids' Evercat Backpack & Lunch Kit Combo
B: Under Armour Boy's Storm Scrimmage Backpack, Black (001)/Silver, One Size Fits All
Answer: B,A