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: I was at the beach with friends. Sentence2: We were bored and didn't know what to do. Sentence3: We began collecting seashells. Sentence4: The seashells were really colorful and unique. Sentence5: So we decided to sell them at five dollars each.
Output:
I (myself), Friends