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: Dale lived on a boat. Sentence2: One morning before his daily swim he didn't look around. Sentence3: When he jumped in his splash attracted attention. Sentence4: A shark swooped in and bit him. Sentence5: At the hospital, Dale checked the want ads for a house on land.
Output:
Dale, Shark