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:
theoxena scissaria is a species of moth.

Ex Output:
theoxena scissaria


Ex Input:
slow dazzle is the fifth studio album by multi-instrumentalist john cale.

Ex Output:
slow dazzle


Ex Input:
castle house school is a preparatory day school for boys and girls in england.

Ex Output:

castle house school