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: James found a robber in his house. Sentence2: He decided to get a gun for protection. Sentence3: He didn't know anything about guns, but he didn't care. Sentence4: That night, he heard a noise. Sentence5: He shot into the darkness and ended up hitting his cat.
James, Robber, Cat