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: Brianna was a willful child without a strong adult figure. Sentence2: As a result of her willfulness, very few people wanted to watch her. Sentence3: One day, a college girl named Rena watched after Brianna. Sentence4: She realized that what Brianna needed was somebody to care about her. Sentence5: Rena decided to babysit Brianna and provide her with stability.
Brianna, Rena, People