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.

Ex Input:
the king of fighters '94 is a 1994 fighting game released by snk for the neo geo arcade and home consoles.

Ex Output:
the king of fighters


Ex Input:
hexameter is a metrical line of verse.

Ex Output:
hexameter


Ex Input:
dil se dil tak (english: from heart to heart) was an indian hindi romantic television drama, which premiered on 30 january 2017 and aired on colors tv.

Ex Output:

dil se dil tak