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: Charles rented a room in May's house. Sentence2: One day, Charles had an urge to try his luck in Vegas. Sentence3: He was very lucky at dice, making six thousand his first night. Sentence4: He stayed in Vegas for two weeks, gambling, making $80,000. Sentence5: He came home and someone was in his place, May rented his room out.

Ex Output:
May, Someone, Charles

Ex Input:
Sentence1: My dog died last year from old age. Sentence2: He was buried under a huge pink rose bush. Sentence3: We buried him inside his favorite carrier, a red one. Sentence4: We placed a professionally made stone on his grave. Sentence5: The inscription said he was a dog with the heart of a lion.

Ex Output:
I (myself), Dog

Ex Input:
Sentence1: Frank went to call his boss to inform her that he was sick. Sentence2: He picked up his phone but dropped it immediately into the sink. Sentence3: His phone malfunctioned and he couldn't use it. Sentence4: Without any way of calling in, Frank went to work sick. Sentence5: Frank got everyone in the office sick too.

Ex Output:
Frank