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 king of fighters '94 is a 1994 fighting game released by snk for the neo geo arcade and home consoles.
Example Output: the king of fighters

Example Input: elisabeth charlotte of the palatinate, daughter of france by marriage (27 may 1652 - 8 december 1722) was a german princess and the wife of philippe of france, duke of orléans, younger brother of louis xiv.
Example Output: elisabeth charlotte of the palatinate

Example Input: chemilly-sur-serein is a commune.
Example Output:
chemilly-sur-serein