Given the task definition and input, reply with output. 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: Hera's family was poor and did not have much money for food. Sentence2: Hera often did not eat breakfast on the way to school. Sentence3: She approached the principal one day about providing free breakfast. Sentence4: The principal listened and the next school year, breakfast was free. Sentence5: Hera was happy to have helped her situation and others.
Hera, Others, Family, Principal