Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Input: Consider Input: The bells were ringing for Chuck Berry when this song made it to No1. His first and only British No. 1. What song?

Output: chuck berry

Input: Consider Input: Who in the 1930's wrote the novel 'Cakes And Ale'?

Output: cakes and ale

Input: Consider Input: An official Disney Princess, what is the name of the princess of Agrabah, heroine of the film Aladdin?
Output: aladdin