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: At the foot of the stairs the Irishman paused in the act of descending, and raised the taper aloft so that its light might fall full upon the face of his companion.
Example Output: Irishman

Example Input: A person skis quickly down a snow covered hill.
Example Output: person

Example Input: We tied Toby to the hall table, and reascended the stairs.
Example Output:
Toby