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: Ruth was visiting her grandfather's farm. Sentence2: She liked animals but the tall horses scared her. Sentence3: Ruth's grandpa brought her to one of the horses. Sentence4: He showed Ruth that the horse was kind and gentle. Sentence5: Soon Ruth felt much less scared and calmed down.

Ex Output:
Ruth, Grandpa

Ex Input:
Sentence1: Burt left his car windows down one sunny day in New Jersey. Sentence2: The weather changed and soon it started to downpour. Sentence3: Burt ran to his car and rolled up his windows during the storm. Sentence4: The inside was not very wet yet. Sentence5: Burt sighed in relief and vowed to never be so foolish again.

Ex Output:
Burt

Ex Input:
Sentence1: Bette works in a retail store and was offered a promotion. Sentence2: Bette wasn't sure because it required her to wake up very early. Sentence3: Bette spoke with her husband and he convinced her they need the money. Sentence4: Bette accepted the promotion and soon adjusted to the early hours. Sentence5: Now Bette gets paid well and likes her new position at her job.

Ex Output:
Bette, Her husband