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: Sierra was shopping for food. Sentence2: She noticed a blender on sale. Sentence3: She hadn't been planning on getting one. Sentence4: Randomly, she decided to buy it. Sentence5: She paid and brought it home.
Sierra