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

Ex Input:
Who has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?

Ex Output:
the dark tower


Ex Input:
In America, as what was Bill Shoemaker famous?

Ex Output:
bill shoemaker


Ex Input:
Who played a bisexual bank robber in the 1975 film `Dog Day Afternoon`?

Ex Output:

dog day afternoon