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: a detritivore (also known as decomposers) is an animal that feeds on dead organisms (living things) and breaks them down into smaller molecules.
Example Output: detritivore

Example Input: sonic firestorm is the second studio album by english power metal band dragonforce released through on may 11, 2004.
Example Output: sonic firestorm

Example Input: dombresson was a municipality of the district val-de-ruz in the canton of neuchâtel in switzerland.
Example Output:
dombresson