TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: saint petersburg stadium

PROBLEM: pope innocent vi (; c. 1282 – september 12, 1362), born étienne aubert, was a french cleric of the roman catholic church and the 200th pope from december 18, 1352 until his death in 1362.

SOLUTION: pope innocent vi

PROBLEM: language death is when a language stops being used as a first language (also called mother language or native language) and as a second language, which it then becomes an extinct language.

SOLUTION:
language death