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: Last year Paul was about an inch too short for the big roller coaster. Sentence2: He was confident when he walked up to the measuring stick. Sentence3: Sure enough, he had grown well over an inch. Sentence4: He proudly got on the roller coaster. Sentence5: It was as much fun as he expected it to be!

Ex Output:
Paul

Ex Input:
Sentence1: Jane loved going dancing. Sentence2: Her husband didn't know how. Sentence3: Jane convinced him to take dance lessons. Sentence4: They both went twice a week. Sentence5: After a while Jane's husband was a decent dancer.

Ex Output:
Jane, They both, Husband

Ex Input:
Sentence1: Ann let her daughter Mae bake a cake. Sentence2: Mae baked the cake all by herself. Sentence3: She measured everything and put it in the oven. Sentence4: When the cake was done it looked delicious. Sentence5: She forget to add oil and it tasted awful.

Ex Output:
Ann, Mae