You will be given a definition of a task first, then some input of the task.
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: It had been raining all night. Sentence2: The rainy stopped when the sun came up. Sentence3: Martha saw a glorious rainbow at sunrise. Sentence4: She snapped a picture with her phone. Sentence5: After, she posted it on Facebook.
Output:
Martha