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: john snow costume
Product list:
A: Men's Medieval Costume - Warrior King Black
B: Cosplaysky Game of Thrones Jon Snow Costume Night's Watch Outfit Large
Answer: B,A