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:
orathanadu taluk is a taluk of thanjavur district in the indian state of tamil nadu.

Ex Output:
orathanadu taluk


Ex Input:
tornio ("") is a town in lapland, finland.

Ex Output:
tornio


Ex Input:
an agency is an organization which acts on behalf of others.

Ex Output:

agency