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

Ex Input:
What was the first Apollo mission to leave Earth orbit and orbit the moon, in 1968?

Ex Output:
apollo


Ex Input:
What nationality was Che Guevara?

Ex Output:
che guevara


Ex Input:
Which city does David Soul come from?

Ex Output:

david soul