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: Dave was a scientist. Sentence2: Dave wanted to make a great scientific discovery. Sentence3: Dave worked with algae to make electricity. Sentence4: Dave discovered he could make electricity with algae! Sentence5: Dave was awarded for his great discovery.

Ex Output:
Dave

Ex Input:
Sentence1: Muriel and her sister always took the shortcut home. Sentence2: One day they decided to take the long way home. Sentence3: A strange man followed them and they got scared. Sentence4: They started running and screaming until they made it home. Sentence5: They told their parents and now they pick them up.

Ex Output:
Strange man, Muriel's parents, Muriel's sister, Muriel

Ex Input:
Sentence1: There was a boy named Anthony in first grade. Sentence2: He never wanted to share his blocks with the other kids. Sentence3: One day a kid had better blocker than Anthony. Sentence4: Anthony asked the kid to play with the blocks and the kid agreed. Sentence5: After that Anthony learned the meaning of sharing.

Ex Output:
Anthony, Other kids, Kid