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: Dennis was cleaning up his baby's toys. Sentence2: He found a soft toy duck that was soaking wet. Sentence3: He couldn't even tell what had made the duck wet. Sentence4: To be safe, he threw it in the wash. Sentence5: Luckily it came out perfectly clean.
Baby, Dennis