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: I was super nervous for my science test yesterday. Sentence2: I studied very hard but it didn't calm my nerves enough. Sentence3: As I walked into the room I wanted the test over with. Sentence4: Finally I started taking the test. Sentence5: Thankfully it wasn't as hard as I thought it would be.
Example Output: I (myself)

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: Grace was out for a walk in her neighborhood. Sentence2: She saw a big mound of red dirt. Sentence3: She kicked it to see what would happen. Sentence4: A swarm of fire ants poured out of the mound Sentence5: Grace turned and ran as fast as she could.
Example Output:
Grace