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 didn't know he was being followed. Sentence2: When he got on the train, a man approached him. Sentence3: He handed John a small piece of paper. Sentence4: It said RAVINCORP in bold letters. Sentence5: John had been offered a job by the CIA, he just didn't know it yet.
A:
John, Man