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: Jake had locked himself out of his house. Sentence2: He was a slender man so he thought he could use the chimney. Sentence3: He climbed to the roof and shimmied down the chimney. Sentence4: His feet reached the floor but he could go no further. Sentence5: Twelve hours later someone heard his screams and he was rescued.
Output:
Someone, Jake