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.
Q: Sentence1: Zach knew he would be rich one day. Sentence2: He told his friends and family this but they didn't believe him. Sentence3: He worked as hard as he could for a whole year, every single day. Sentence4: His friends and family were worried because Zach became very poor. Sentence5: But, he proved them wrong, and made a million dollars that year.
A:
Zach