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 1939–40 nhl season was the 23rd season for the national hockey league.

Output: 1939–40 nhl season


Input: Consider Input: kazuya maeda (born 8 september 1982) is a japanese football player.

Output: kazuya maeda


Input: Consider Input: the battle of harpers ferry was fought september 12–15, 1862.


Output: battle of harpers ferry