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: henan is a province of the people's republic of china.
Example Output: henan

Example Input: vehari district is a district in the punjab province of pakistan.
Example Output: vehari district

Example Input: imperial vengeance are a metal band from the uk.
Example Output:
imperial vengeance