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:
air jamaica is the national airline of jamaica from kingston, jamaica.

Ex Output:
air jamaica

Ex Input:
a sonata is a piece of music for one instrument or one instrument with another instrument accompanying.

Ex Output:
sonata

Ex Input:
charlotte mailliard shultz, rvo (born charlotte smith; september 26, 1933) is an american heiress and socialite.

Ex Output:
charlotte mailliard shultz