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: 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: Barry took a science class. Sentence2: He didn't expect an essay. Sentence3: He took a test with one. Sentence4: He did his very best. Sentence5: Barry didn't do so well.
Example Output: Barry, Science class

Example Input: Sentence1: Neil was cleaning out his freezer. Sentence2: He saw a bag of food in the freezer that was unmarked. Sentence3: Neil couldn't remember what the food was. Sentence4: He threw the item away. Sentence5: Neil was more careful to mark all items that he stored.
Example Output:
Neil