Q: 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 at the ball game. Sentence2: He ordered a hot dog. Sentence3: When he got it he took a bite without looking. Sentence4: The hotdog was soaked in tons of mustard. Sentence5: Sam complained and got another one.
A:
Sam