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: metal constructor for boys
Product list:
A: StemKids Erector Constructor - Baron (Retro Plane) Model Building Set, 254 Pieces, for Ages 8+, 100% Compatible with All Major Brands Including Meccano Educational STEM Learning Sets for Kids
B: KAIM STEM Helicopter Metal Model Building Kit, Building Toy Kit for Boys & Girls Age 6-14 Years and Up
Answer: B,A