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:
yoshihiro uchimura (born 24 august 1984) is a japanese football player.

Ex Output:
yoshihiro uchimura


Ex Input:
the palaeoptera is the group of primitive (basal) winged insects which do not fold the wings back over the abdomen, as neoptera do.

Ex Output:
palaeoptera


Ex Input:
the lexington barbecue festival is a one-day food festival held each october in lexington, north carolina, a city that calls itself the "barbecue capital of the world."

Ex Output:

lexington barbecue festival