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: Jonathan was running late for work. Sentence2: He had to park in the parking garage. Sentence3: The first four levels were completely full. Sentence4: Jonathan parked on the level five and had a long walk. Sentence5: Jonathan was an hour late for work.
A:
Jonathan