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: Vicki was not popular. Sentence2: She had told a series of big lies to her friends. Sentence3: No one could trust her anymore. Sentence4: She told her friends that she was sorry, but none of them believed her. Sentence5: Vicki decided she had a lot of work to do.
Vicki, Friends