Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Q: the usl w-league is a national women's soccer league.

A: w-league
****
Q: a mathematician's apology is a book about mathematics which was written in 1940.

A: a mathematician's apology
****
Q: interpol is the short form of international criminal police organization.

A:
interpol
****