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: Sam was driving home from work. Sentence2: It was night and had been raining. Sentence3: The car in front of him lost control. Sentence4: It veered into oncoming traffic and hit another car. Sentence5: Sam was traumatized from witnessing it.
Output:
Sam