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: an air raid is an attack in which bombs are dropped from aircraft on to a ground or sea target.

Output: air raid


Input: Consider Input: louise leakey (born 21 march 1972) is a kenyan paleontologist.

Output: louise leakey


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


Output: giorgio chiellini