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.

Example Input: hexameter is a metrical line of verse.
Example Output: hexameter

Example Input: dominique dropsy (9 december 1951 – 7 october 2015) was a french footballer.
Example Output: dominique dropsy

Example Input: le nozze di figaro, ossia la folle giornata ("the marriage of figaro, or the day of madness") is an opera buffa with music by wolfgang amadeus mozart and an italian libretto by lorenzo da ponte.
Example Output:
the marriage of figaro