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.

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

Output: esther peterson

Input: Consider Input: songkran is a festival held every year in thailand on april 13.

Output: songkran

Input: Consider Input: mark cavendish (born 21 may 1985) is a manx racing cyclist who rides for team dimension data.
Output: mark cavendish