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: giorgio chiellini (born 14 august 1984) is an italian football player.

Output: giorgio chiellini

Input: Consider Input: the river trent is one of the major rivers of england.

Output: river trent

Input: Consider Input: michelle kwan (born july 7, 1980) is a retired american figure skater.
Output: michelle kwan