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: John read a book that changed his life. Sentence2: He began voraciously reading after this. Sentence3: He learn he can live a thousand lives by reading a thousand books. Sentence4: He soaked up a lot of wisdom. Sentence5: He grew as a person, and became fulfilled and happy.
A:
John