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: Susie decided to have a sleepover with her friends. Sentence2: She got about four girls together. Sentence3: When they girls got there they ordered some pizza. Sentence4: Susie ended up having a lot of fun. Sentence5: She could not wait to invite them over again.
Girls, Susie, Susie's friends