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:
stinging nettles ("urtica dioica") are a type of plant which have stinging defensive hairs on the leaves and stems.

Ex Output:
stinging nettle


Ex Input:
morsain is a commune.

Ex Output:
morsain


Ex Input:
reykjanesbær is a municipality in south western iceland.

Ex Output:

reykjanesbær