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: I walked to my classroom. Sentence2: I was confused since no person waiting outside of the room. Sentence3: My friend eventually came. Sentence4: He told me that class was cancelled for today. Sentence5: I started to head home.

Ex Output:
I (myself), Friend

Ex Input:
Sentence1: Neil was in his mother's attic. Sentence2: He found a shoebox full of old family photos. Sentence3: Neil went to a copy service. Sentence4: He made several copies of all the pictures. Sentence5: Neil shared all the pictures with his family.

Ex Output:
Neil, Family, His mother

Ex Input:
Sentence1: Ken was happy to divorce his wife. Sentence2: He thought things would be better some place else. Sentence3: He was wrong. Sentence4: Life got much harder. Sentence5: He really regretted leaving his family.

Ex Output:
Ken, Family, Wife