You will be given a definition of a task first, then an example. Follow the example to solve a new instance 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: 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.
Solution: I (myself), Dog
Why? There is only two characters in given story, i.e., I (myself) and dog.

New input: Sentence1: I was the smallest kid on my football team. Sentence2: I knew I had to work harder than everyone else. Sentence3: In practice I stayed late, until the coaches had to kick me out. Sentence4: In our first game I made three great runs and scored two touchdowns. Sentence5: After the game, the coach gave me the game ball.
Solution:
I (myself), Coaches, Football team