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: My niece has a cat that is devoted to her. Sentence2: She is away at college but came back last weekend. Sentence3: She was getting ready to leave Monday. Sentence4: The cat sat on her lap to try to prevent her from leaving. Sentence5: She took a photo on Snapchat.
I (myself), Niece, Cat