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: Keith woke up early one morning. Sentence2: He decided to make toast for breakfast. Sentence3: He put his bread in the toaster and waited. Sentence4: But after five minutes, it still hadn't browned at all! Sentence5: Keith realized that he'd forgotten to plug in the toaster.
Keith