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:
a detritivore (also known as decomposers) is an animal that feeds on dead organisms (living things) and breaks them down into smaller molecules.

Ex Output:
detritivore


Ex Input:
aaron sherritt (1855 - 26 june 1880) was a close friend of joe byrne and later ned kelly.

Ex Output:
aaron sherritt


Ex Input:
in 2013, esther peterson was inducted into the us department of labor's hall of honor.

Ex Output:

esther peterson