Instructions: 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: Peter went to bed really early last night. Sentence2: He was really glad to have that happen. Sentence3: He got to wake up early this morning. Sentence4: He got up so early that he was able to get all his work done at noon. Sentence5: Now Peter has the rest of the day off.
Output:
Peter