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.
Problem:Sentence1: Mark had a 9am flight to Chicago. Sentence2: He woke up late and hit traffic, it was 8:50 when he got to the gate. Sentence3: He had to wait in a very long line and he was sure to miss his flight. Sentence4: Just then, they announced that the plane to Chicago was delayed. Sentence5: Mark got lucky and felt relief because he had time to make his flight!
Solution:
Mark