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: They sat down, one on one side of the round centre table, and one on the other, and Junius began his statement.
Example Output: They

Example Input:   A boy is playing hopscotch.
Example Output: boy

Example Input: Half an hour after breakfast, while Ralph and Kit were in the stable, the sound of wheels was heard, and a stout, broad-shouldered man, with a bronzed complexion, drove up in a farm wagon.
Example Output:
man