Instruction: Given a query and a list of products denoted as A, B, C, ... with their titles, rank the products according to their relevance to the query. Output only a ranked list in which the most relevant product is at the top of the list.

Input:
Query: pecs communication book
Product list:
A: Plastic Visual ASD Now, Next and Later Board (Picture Communication Symbols)
B: Activity Binder: Picture Exchange Communication System (PECS)
C: Small PECS Communication Book (Picture Exchange Communication System)
Answer: C,B,A