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: Tom lost his wallet at the bar. Sentence2: He went back to look for it but it was gone. Sentence3: One day he found it in his mail box. Sentence4: The money was gone but everything else was there. Sentence5: Tom was thankful and upset.
A:
Tom