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.

Sentence1: Calvin was so excited! Sentence2: His friends were coming over for a birthday party. Sentence3: He cleaned his room and decorated the play room. Sentence4: They came over and brought him gifts. Sentence5: He had a great time!
Friends, Calvin

Sentence1: I was going home when i decided to take a bus. Sentence2: I was alone so a woman asked me if she could sit with me. Sentence3: Then i let her sit beside me. Sentence4: When i woke up the woman was gone. Sentence5: My bag was opened so i checked my phone and it was gone too.
I (myself), Woman

Sentence1: Lilly and Al's dad warned them to look out for sharks in the water. Sentence2: They laughed at him, saying there weren't any sharks. Sentence3: When they weren't paying attention, he swam underwater towards them. Sentence4: He had a fake shark fin attached to his back. Sentence5: They were so scared they ran screaming out of the water.
Lilly, Shark, Lilly and al's dad, Al