In this task, you are given a sentence which contains a motion and your task is to identify the physical entities involved in the motion. The input sentence can have more than one entity and also there is at least one entity that takes part in physical motion. There are two types of entities which are animate (beings that are alive) and inanimate entities (beings that are not alive).

Example Input: The dense fog rolled away like a heavy cloud and suddenly the sun shot his bright rays over the island.
Example Output: fog

Example Input: A man is kneeling down painting a curb.
Example Output: A man

Example Input: Three martial artists with black belts do a demonstration for younger children.
Example Output:
martial artists