Definition: 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: Henry had to go in for surgery last week. Sentence2: He had appendicitis. Sentence3: It started when he felt a sudden pain in his appendix. Sentence4: Ultimately, he had to have his appendix removed. Sentence5: But now, at least, he doesn't have to worry about it.
Output:
Henry