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: It snowed a lot yesterday. Sentence2: Sally and I had to shovel the sidewalk. Sentence3: Sally made a snowball and threw at me. Sentence4: I made a snowball and threw it back at Sally. Sentence5: We ended of having a snowball fight instead of shoveling snow.
Output:
I (myself), Sally