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: A friend of mine is always testing his luck with the law. Sentence2: He rather sell drugs than get a job. Sentence3: The last I heard is he started to traffic across state lines. Sentence4: Yesterday the DEA came looking for him. Sentence5: Later in the evening news he was arrested with drugs.

Output: I (myself), Dea, Friend

Input: Consider Input: Sentence1: Tom was in a hurry to get to work. Sentence2: He didn't have enough time to match his socks. Sentence3: At the office his co-workers made fun of him. Sentence4: His boss questioned his attire as well. Sentence5: Tom never made that mistake again.

Output: Boss, Co-workers, Tom

Input: Consider Input: Sentence1: John never changed the oil in his car. Sentence2: He thought he didn't need to. Sentence3: On his way to work his car clunked out. Sentence4: He couldn't make it to work. Sentence5: He regretted not changing his oil
Output: John