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: One day last week, I saw an Opossum in my yard. Sentence2: He was a friendly one. Sentence3: He liked to walk around my yard with my dogs. Sentence4: He hung around all day. Sentence5: I never saw him again.
I (myself), Opossum, Dogs