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 needed to lose twenty five pounds to join the military. Sentence2: He decided to set a weight loss goal and started working out. Sentence3: Zach ran and exercised every single day for two months. Sentence4: He decided to weigh himself and noticed he lost twenty seven pounds. Sentence5: Zach joined the military without any problems.
Zach