Given the task definition and input, reply with output. 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: Sophie wanted to get a pet. Sentence2: Her landlord wouldn't let her get one. Sentence3: She decided to get one anyway, and got a cat. Sentence4: Her landlord found out she had gotten a cat. Sentence5: Luckily, her landlord had 10 cats herself, and so didn't mind.
Landlord, Sophie, A cat, 10 cats