Instructions: 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.
Input: Sentence1: Charles read a lot of information online about hypnotism. Sentence2: He convinced himself that it was possible. Sentence3: He trained to be a hypnotist. Sentence4: He tried to hypnotize his brother. Sentence5: He only succeeded in convincing his brother it didn't work.
Output:
His brother, Charles