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: 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: Karen liked a diner in her town. Sentence2: She loved their burgers. Sentence3: The diner changed their recipe for the burgers. Sentence4: Karen didn't like the new recipe. Sentence5: She stopped going to the diner.
Karen

Sentence1: I couldn't stand not getting my messages anymore. Sentence2: I called my service provider. Sentence3: They were extremely unfriendly and unhelpful. Sentence4: I complained to the supervisor. Sentence5: Before the day was up, I had a new phone on its way to me.
I (myself)