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.

Ex Input:
Sentence1: Kim was a clumsy girl. Sentence2: She slipped on a banana peel. Sentence3: She hurt her head. Sentence4: She got stitches at the doctors. Sentence5: Kim was much more careful after that.

Ex Output:
Kim, Doctors

Ex Input:
Sentence1: I used to deliver fliers everyday in the hot sun. Sentence2: My water bottle always ended up really hot. Sentence3: When I put ice in it, the ice melted. Sentence4: I decided to buy a special thermos that kept the cold in. Sentence5: Now I always had cold water when I was in the hot sun.

Ex Output:
I (myself)

Ex Input:
Sentence1: Jane was reading in bed. Sentence2: Suddenly, she noticed loud music coming from next door. Sentence3: She tried to ignore it but it persisted for hours. Sentence4: Finally, she marched next door. Sentence5: She yelled at her neighbor, who apologized profusely.

Ex Output:
Jane, Neighbor