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: Cory was a tree trimmer. Sentence2: He was hired to cut the extra branches off his neighbor's tree. Sentence3: Unfortunately one of the branches fell and knocked him off his ladder. Sentence4: Cory was in pain, but not badly hurt. Sentence5: He was much more careful about where he was cutting after that.
Output:
Cory, Neighbor