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: He walked beside her in silence for a moment, and then he added, "I have had no trouble in seeing that you are beginning to avoid me.
Example Output: He

Example Input: We had reached the same crowded thoroughfare in which we had found ourselves in the morning.
Example Output: We

Example Input: A boy with a hat is seen walking and talking behind some trees.
Example Output:
boy