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: royal shade rectangle shade
Product list:
A: Alion Home 9.5' x 15' Rectangle Waterproof Polyester Woven Sun Shade Sail (1, Royal Blue)
B: Royal Shade 12' x 16' Gray Rectangle Sun Shade Sail Canopy Outdoor Patio Fabric Shelter Cloth Screen Awning - 95% UV Protection, 200 GSM, Heavy Duty, 5 Years Warranty, We Make Custom Size
C: Royal Designs DDS-29-20AGL (8 x 4.25) x (20.5 x 10) x 12.5 Rectangle Inverted Corner Gallery Designer Lamp Shade, Antique Gold
Answer: B,A,C