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

Ex Input:
Where is Charles Darwin buried?

Ex Output:
charles darwin


Ex Input:
Which city has sports teams known as the 'Maple Leafs' and the 'Blue Jays'?

Ex Output:
toronto blue jays


Ex Input:
Who played Philip Marlowe in the 1946 film `The Big Sleep`?

Ex Output:

the big sleep