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: Ricki arrived at the lifeguarding class and she was older than others. Sentence2: The instructor was her age and the rest were teenagers. Sentence3: She was the only one that offered to try new things and go first. Sentence4: The rest of the class was quiet and wouldn't share or participate Sentence5: Ricki learned a lot and did well at her class each time.
Output:
Lifeguarding class, The instructor, Others, Ricki