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: Jane got pregnant. Sentence2: She did was using birth control. Sentence3: The doctor said the baby could come out wrong. Sentence4: Jane wasn't ready for all that. Sentence5: She decided to get an abortion.

Ex Output:
Jane, Baby, Doctor

Ex Input:
Sentence1: Katherine was at home watching TV. Sentence2: Suddenly she got a phone call. Sentence3: Her dad had had a heart attack and was in the hospital. Sentence4: She quickly went to the hospital to be with him. Sentence5: Luckily, he recovered in a couple of days and was alright.

Ex Output:
Dad, Katherine

Ex Input:
Sentence1: Sally bought a brand new cell phone. Sentence2: She thought that the case it came with was too clunky. Sentence3: She threw away the case. Sentence4: The next day she dropped her phone. Sentence5: The screen shattered.

Ex Output:
Sally