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.

Example Input: Sentence1: Bob loved to eat fat. Sentence2: His friends thought he ate too much. Sentence3: Indeed, the fat increased Bob's cholesterol intake dramatically. Sentence4: Bob's arteries were becoming clogged. Sentence5: After many years, Bob had a heart attack and died.
Example Output: Friends, Bob

Example 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.
Example Output: I (myself), Dea, Friend

Example Input: Sentence1: Joe had a girlfriend he loved very much. Sentence2: They had both finished college and had big plans. Sentence3: One morning, Joe decided he wanted to travel. Sentence4: He talked with his girlfriend, but she wanted a family. Sentence5: Joe gave up on all of his dreams of travel to raise children.
Example Output:
Girlfriend, Joe, Children