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: Zach took up amateur bodybuilding when he was a teenager. Sentence2: He has been working hard for years and decided to compete. Sentence3: He entered a competition in Chicago. Sentence4: He ended up winning first place! Sentence5: He got to be featured on the cover of a bodybuilding magazine!
Output:
Zach