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: the boeing international headquarters (colloquially known as the boeing building and formerly known as the morton international building) is a 36-floor skyscraper located in the near west side of chicago.
Example Output: boeing international headquarters

Example Input: the nemean lion ( ""; latin: "leo nemaeus") was a vicious monster in greek mythology that lived at nemea.
Example Output: nemean lion

Example Input: leo c. zeferetti (july 15, 1927 – march 21, 2018) was an american politician.
Example Output:
leo c. zeferetti