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.

Example input: Sentence1: My dog was bored. Sentence2: I was working all day so I couldn't spend time with him. Sentence3: When I finished work I decided to play with my dog. Sentence4: He was so happy to finally have some fun! Sentence5: Alas, he fell sick and died.
Example output: I (myself), Dog
Example explanation: There is only two characters in given story, i.e., I (myself) and dog.
Q: Sentence1: The family was on a boat. Sentence2: They were going on a dolphin cruise. Sentence3: As soon as they took off, they saw several of them! Sentence4: The dolphins chased them and jumped out of the water. Sentence5: They took lots of pictures of the animals.
A:
The family, Dolphins