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:
capellen is a town in the commune of mamer, in south-western luxembourg, 12 km west of luxembourg city.

Ex Output:
capellen


Ex Input:
diana ross is a famous american soul and pop singer.

Ex Output:
diana ross


Ex Input:
real madrid castilla is a spanish football team.

Ex Output:

real madrid castilla