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: Megan's heart was pounding. Sentence2: She was tracking a Grizzly bear. Sentence3: She found a huge paw print in the mud. Sentence4: She was getting closer! Sentence5: Soon she could see it standing far off near the river.
Megan, Grizzly bear