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: r2d2 sphero
Product list:
A: Hermitshell Hard EVA Travel Black Case Fits Sphero Star Wars R2-D2 / R2-Q5 App-Enabled Droid
B: Sphero Mini (Orange) App-Enabled Programmable Robot Ball - STEM Educational Toy for Kids Ages 8 & Up - Drive, Game & Code with Sphero Play & Edu App, 1.57"
Answer: B,A