Instruction: Evaluate the relevance of each product title in the input to the given query, and then sort the products in descending order of relevance, placing the most relevant product at the top of the ranked list.

Input:
Query: gardian clean step indoor
Product list:
A: Guardian Silver Series Indoor Walk-Off Floor Mat, Vinyl/Polypropylene, 4'x6', Black
B: Notrax - 109S0035CH 109 Brush Step Entrance Mat, for Home or Office, 3' X 5' Charcoal
Answer: A,B