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: Kia's mom called her out into the yard. Sentence2: Kia went, perplexed. Sentence3: But then she saw what her mom was pointing at. Sentence4: Her mouth fell open in awe. Sentence5: There was a rare and beautiful double rainbow overhead!
Kia, Kia's mom

Sentence1: Erin was cleaning out his basement one morning. Sentence2: While he was cleaning it, he found an old antique watch. Sentence3: He searched on the internet to see what type of watch it was. Sentence4: He realized that it was a watch from the 1800s! Sentence5: He decided to put it on Ebay and he made a lot of money.
Erin

Sentence1: Helen checked out a few items at the supermarket. Sentence2: The cashier tried to swipe her credit card. Sentence3: Helen didn't believe the fact that her credit card was declined. Sentence4: She tried to argue with the cashier. Sentence5: In the meanwhile, other customers were yelling at Helen.
Customers, Cashier, Helen