You will be given a definition of a task first, then some input of the task.
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: I'm a big fan of Calvin and Hobbes. Sentence2: I've been slowly collecting books of the comics over the Year's. Sentence3: There were still a few that I could never find. Sentence4: And there were some strips that had never been in a collection. Sentence5: Finally, ,my parents gave me a big leather-bound complete collection.
Output:
I'm, Parents