Definition: 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.
Input: Sentence1: Teresa went for a hike. Sentence2: On the path, she saw a rattlesnake. Sentence3: She and the rattlesnake both froze. Sentence4: Finally, the rattlesnake moved on. Sentence5: Teresa never went hiking alone again.
Output:
Teresa, Rattlesnake