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: Zachary regretted not being nicer to his children. Sentence2: He was abusive and mean as a father. Sentence3: One day Zachary called his children and sobbed about his wrongs. Sentence4: His children were very open to starting fresh with their father. Sentence5: Zachary couldn't alter the past but he made changes for the better.
Output:
Zachary, His children