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: Shawn was obsessed with flying. Sentence2: He built a contraption with wings he believed would fly. Sentence3: Shawn went to the top of his barn and took off in the contraption. Sentence4: Unexpectedly, he flew up into the air like a bird. Sentence5: Shawn flew up and away, never to return to Kansas.
Shawn