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: Ava needed a root canal badly- she was always in pain. Sentence2: But she was terrified of dentists! Sentence3: Finally the agony drove her to make an appointment. Sentence4: The dentist was very kind when she arrived, and put her at ease. Sentence5: And to her shock, the root canal didn't hurt one bit!

Ex Output:
Dentist, Dentists, Ava

Ex Input:
Sentence1: Steve was very nervous to ask Tina out on a date. Sentence2: Steve had liked Tina for months now, but they never really spoke. Sentence3: Steve got encouragement from his friends to ask her to hang out. Sentence4: Steve gathered courage and asked Tina to study together that night. Sentence5: Tina said yes and soon they started dating each other!

Ex Output:
Steve, Friends, Tina

Ex Input:
Sentence1: It was Charles' first time in Las Vegas and he was having fun. Sentence2: First he went to a club and danced with a model in a private room. Sentence3: After the club, Charles and his friend went to an after-party. Sentence4: The after-party was celebrating the end of filming a TV series. Sentence5: Charles took a selfie with an actor and posted it on Facebook.

Ex Output:
His friend, Charles, A model, An actor