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: Evan is a Sailor in the Navy. Sentence2: He is on a ship that travels around the world. Sentence3: He went to visit Spain and came home with sea shells from the beach. Sentence4: He gave those sea shells to a pretty girl named April. Sentence5: She liked them so much they decided to get married.
Example Output: Is

Example Input: Sentence1: Dirt Nasty was a rapper. Sentence2: He spun rhymes about his escapades. Sentence3: He was so good at it, they forgot there was a person behind the name. Sentence4: Thus Dirt fell into a depression. Sentence5: In his depression, he gave up rap, and took up advocacy work.
Example Output: Dirt nasty

Example Input: Sentence1: Michael was a fifteen year old boy with a big imagination. Sentence2: He always put his mind to work creating new stories to tell. Sentence3: He always dreamed of building a three story treehouse. Sentence4: Michael put all of his thoughts on paper to build it. Sentence5: Michael finally built the treehouse of his dreams.
Example Output:
Michael