You will be given a definition of a task first, then some input of the task.
In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: Tom was always late. Sentence2: His friends realized this early on. Sentence3: They always told him to be somewhere half an hour before. Sentence4: Tom started figuring out their trick. Sentence5: He wound up being later than half an hour most times.
Output:
His friends, Tom