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 global hunger index is a measurement to measure the hunger situation in a country.

Ex Output:
global hunger index


Ex Input:
roger mudd (born february 9, 1928) is an american broadcast journalist.

Ex Output:
roger mudd


Ex Input:
entrechaux is a commune of 869 people (1999).

Ex Output:

entrechaux