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: Don was four years old. Sentence2: He wanted to ride in a baby stroller. Sentence3: He could no longer fit in the stroller. Sentence4: This made him angry. Sentence5: He cried because he does not want to keep growing.
Example Output: Don

Example Input: Sentence1: After failing at employment and education, Mike felt lost. Sentence2: He called his parents for help who told him to move back in. Sentence3: Mike's parents were very worried and decided to send him to therapy. Sentence4: Mike then began to see a psychiatrist a few times a week. Sentence5: After the therapy, Mike began to feel better in life.
Example Output: Mike, Mike's parents, Psychiatrist

Example Input: Sentence1: I was eating in a Japanese bar. Sentence2: My friend suggested we try mochi for dessert. Sentence3: I was eager to try some so I agreed. Sentence4: It was amazing! Sentence5: Alas, the mochi cost too much so we decided not to tip.
Example Output:
I (myself), Friend