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: anna stadling born 11 july 1970 in sundsvall, sweden is a swedish musical artist.
Example Output: anna stadling

Example Input: saint-paul-de-vence is a commune.
Example Output: saint-paul-de-vence

Example Input: the long-beaked echidnas make up one of the two genera (genus zaglossus) of echidna.
Example Output:
long-beaked echidna