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: Warner is a gambling man. Sentence2: He heads to the casino with his lucky quarter. Sentence3: He decides which machine to use. Sentence4: He picks his machine and puts in his lucky quarter. Sentence5: Warner lost his quarter but won $1,000!
Warner