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: Tina had sampled her mom's wine last night. Sentence2: Her mom had caught her and grounded her. Sentence3: But the next morning, Tina woke with a terrible hangover. Sentence4: She thought that was a far worse punishment than the grounding. Sentence5: Tina vowed never to drink alcohol again!

Ex Output:
Tina, Her mom

Ex Input:
Sentence1: Romeo thought he was the fastest kid at school. Sentence2: Romeo challenged his friend to a race on the track. Sentence3: Both of the racers lined up and prepared to take off! Sentence4: However, Romeo's foot slipped and he ended up tripping himself! Sentence5: He skinned his knee badly and was taken away to the nurse.

Ex Output:
Racers, Friend, Romeo

Ex Input:
Sentence1: Laurel wanted to get some ice cream. Sentence2: She visited the local ice cream parlor after work. Sentence3: Laurel clumsily dropped her ice cream. Sentence4: She lamented the loss of her precious ice cream. Sentence5: Laurel rejoiced when the cashier offered her another.

Ex Output:
Laurel, The cashier