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.

Input: Consider Input: a sonata is a piece of music for one instrument or one instrument with another instrument accompanying.

Output: sonata


Input: Consider Input: in egyptain mythology sopdet was the goddess of the star sothis.

Output: sopdet


Input: Consider Input: the bumblebee bat ("craseonycteris thonglongyai"), also known as kitti's hog-nosed bat, is an endangered species of bat.


Output: bumblebee bat