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: sceaux-sur-huisne is a commune.
Example Output: sceaux-sur-huisne

Example Input: the capital of hunedoara county is deva.
Example Output: hunedoara county

Example Input: a diode is an electronic component with two electrodes (connectors) that allows electricity to go through it in one direction and not the other direction.
Example Output:
diode