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: Jen was always told that being a firefighter was only for men. Sentence2: However, she wanted to be a firefighter for her whole life. Sentence3: She trained and practiced very hard to qualify. Sentence4: Year's later she is the chief of her town's fire department. Sentence5: Now Jen looks back at her naysayers with a smirk.
Firefighter, Men, Jen, Jen's naysayers