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: Consider Input: Sentence1: Tom moved out to the coast. Sentence2: He experienced his first earthquake. Sentence3: It was a minor one. Sentence4: Tom freaked out. Sentence5: His friends made fun of him.

Output: Friends, Tom

Input: Consider Input: Sentence1: Zack was always worried about getting sick. Sentence2: And he became so worried about the air that he wore a respirator. Sentence3: He wore it during his entire school day. Sentence4: And he told other students that the air quality was terrible. Sentence5: Zack still ended up getting sick and worried much more.

Output: Other students, Zack

Input: Consider Input: Sentence1: Adam was a carpenter. Sentence2: There was a natural disaster in his area. Sentence3: Many people needed to rebuild or fix their homes. Sentence4: People called Adam for help. Sentence5: Adam's business was busy for months.
Output: Adam, People