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.

Input: Consider Input: Sentence1: Cathy recently took a trip to the Bahamas. Sentence2: While in the Bahamas, Cathy decided to swim with dolphins. Sentence3: Cathy was scared that the dolphins would attack her. Sentence4: However, Cathy was surprised at how docile the dolphins were. Sentence5: Cathy was so glad she took the chance to swim with the dolphins.

Output: Cathy, Dolphins

Input: Consider Input: Sentence1: Jayla was browsing at the library with her son. Sentence2: There was a man at the library. Sentence3: The man was in the children's section. Sentence4: He was staring at the children. Sentence5: Jayla told the clerk to watch the man.

Output: Clerk, Jayla, Children, Her son, A man

Input: Consider Input: Sentence1: Jake had locked himself out of his house. Sentence2: He was a slender man so he thought he could use the chimney. Sentence3: He climbed to the roof and shimmied down the chimney. Sentence4: His feet reached the floor but he could go no further. Sentence5: Twelve hours later someone heard his screams and he was rescued.
Output: Someone, Jake