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.

Input: Consider Input: the saint petersburg stadium (russian: Стадион Санкт-Петербург; also called the krestovsky stadium or zenit arena) is an association football stadium in saint petersburg, russia.

Output: saint petersburg stadium


Input: Consider Input: cartagena (pronounced /kartaˈçena/ in spanish; the usual english pronunciation is /ˌkaːtəˈheɪnə/ or /ˌkaɹɾəˈheɪnə/), also known as cartagena de indias ("cartagena of the west indies"), is a large city seaport on the northern coast of colombia.

Output: cartagena de indias


Input: Consider Input: james turrell (born may 6, 1943) is an american artist.


Output: james turrell