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

Ex Input:
Which female gymnast won Gold Medals in the Balance Beam and Floor Exercise events in the 1972 Summer Olympics?

Ex Output:
1972 summer olympics


Ex Input:
Aaron Copeland wrote a ballet about which American folk hero?

Ex Output:
aaron copeland


Ex Input:
Who replaced David Tennant as Doctor Who in January?

Ex Output:

doctor who