Detailed Instructions: 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.
Q: Sentence1: Karl woke up late for work one day. Sentence2: He didn't know why his alarm didn't go off. Sentence3: Later that day his alarm went off. Sentence4: Karl realized he put PM instead of AM>. Sentence5: He vowed to never make the same mistake again.
A:
Karl