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: pennywise is an american melodic hardcore band.
Example Output: pennywise

Example Input: one of the books that cornelia meigs wrote won the newbery medal in 1934.
Example Output: cornelia meigs

Example Input: the peace corps is an independent united states federal agency.
Example Output:
peace corps