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.
Q: Sentence1: A man had a heart attack while driving today. Sentence2: He was driving 70 miles an hour when it happened. Sentence3: He lost control of his car. Sentence4: He finally hit a passenger vehicle injuring three people. Sentence5: The man died at the scene due to the heart attack.
A:
Passenger vehicle, A man, Three people