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: Jill and Mike loved to play in the rain. Sentence2: Whenever it rained, Jill and Mike would come to the porch. Sentence3: The rain would cover the side of the porch. Sentence4: Jill and Mike used to pretend they were walking along the beach. Sentence5: Jill and Mike played a lot of pretend games on the rain.
Output:
Mike, Jill