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.

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.
Mike, Mike's parents, Psychiatrist

Sentence1: Debra was looking for her cat. Sentence2: Sam said she'd help her. Sentence3: The cat was on a tree. Sentence4: Sam climbed up the tree but fell. Sentence5: The cat jumped down the tree.
Her cat, Sam, Debra

Sentence1: David sat down on the couch after a long hard day of work. Sentence2: He tried to switch on the TV but nothing happened. Sentence3: David called up the company and complained. Sentence4: The next day the repairman didn't arrive. Sentence5: David ended up paying $100 for a new TV instead.
Company, Repairman, David