Task: Query_Product_Rank
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: canon rf 50mm f/1.8 stm lens
Product list:
A: Canon RF 24-105mm f/4L IS USM Lens, Black - 2963C002
B: Canon RF 50mm f/1.2L USM Lens, Black (2959C002)
Answer: A,B