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.

Ex Input:
a voivodeship, also spelled voivodship, voivodina or vojvodina (romanian: "voievodat", polish: "województwo", serbian: "vojvodina" (војводина), "vojvodstvo" (војводство) or "vojvodovina" (војводовина), hungarian: "vajdaság", lithuanian: "vaivadija", latin "palatinatus" in poland), is a geographical administrative division dating to medieval romania, hungary, poland, lithuania, latvia, russia and serbia (see vojvodina), ruled by a voivod ("voivode", "wojewoda").

Ex Output:
voivodeship


Ex Input:
the division of moore is an australian electoral division in the state of western australia.

Ex Output:
division of moore


Ex Input:
t-mobile is a mobile (cell phone) network operator headquartered in bonn, germany.

Ex Output:

t-mobile