Given the task definition and input, reply with output. 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: Noah was excited and nervous to use his new sled. Sentence2: He climbed to the top of the steepest hill in the neighborhood. Sentence3: Noah bravely leaned forward on his sled. Sentence4: His heart raced as he flew down the snowy hill. Sentence5: It was a proud moment when Noah conquered his fear of the steep hill.
Noah