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:
fufu (pounded yam or cassava) is a food dish which first came from west africa, but is enjoyed by many people across the world.

Ex Output:
fufu


Ex Input:
a bite is a wound received from the teeth of an animal.

Ex Output:
bite


Ex Input:
theodor holm nelson (ted nelson, born 1937) is an american sociologist, philosopher, and pioneer of information technology.

Ex Output:

ted nelson