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: call of duty black ops. 2
Product list:
A: Turtle Beach Call of Duty: Black Ops II KILO Limited Edition Stereo Gaming Headset
B: Call of Duty: Black Ops III (PS4)
Answer: B,A