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: Susan was out swimming with friends. Sentence2: They were at a local river. Sentence3: All of a sudden a large gush of water surged through. Sentence4: One of Susan's friend's was washed away. Sentence5: Her body was later discovered.
Output:
Friends, Susan's friend, Susan