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

Input: Consider Input: Who played Lionel Hardcastle in the TV series 'As Time Goes By'?

Output: as time goes by


Input: Consider Input: Who was Domenikos Theotocopoulos better known as?

Output: museum of el greco


Input: Consider Input: Who wrote the stories 'Billy Budd' and 'Moby Dick'?


Output: moby-dick