You will be given a definition of a task first, then some input of the task.
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: Bob always loved going to the local diner. Sentence2: As he drove up one morning he saw flashing lights and sirens. Sentence3: The diner was on fire! Sentence4: It quickly burned to the ground. Sentence5: Thankfully, the diner will rebuild and open again.
Output:
Bob