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

Ex Input:
Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?

Ex Output:
charles dickens


Ex Input:
Which team lost the 2009 Superbowl to the Pittsburgh Steelers?

Ex Output:
super bowl xliii


Ex Input:
Which country is bordered by Belarus in the north and Moldova in the south?

Ex Output:

moldova