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.

[Q]: Sentence1: Simy heard her mom speaking to her grandma about a lost letter. Sentence2: She asked her mom what happened. Sentence3: Her mom said her grandma had lost a special letter from her grandpa. Sentence4: Simy felt sad but soon forgot as she played. Sentence5: While putting her toys away she found the letter on a toy shelf.
[A]: Simy, Grandpa, Mom, Grandma

[Q]: Sentence1: Carl was passionate about computers. Sentence2: He took many classes about computer programming. Sentence3: He decided to build a computer himself. Sentence4: He spent many hours researching and planning the computer. Sentence5: He successfully built the computer and saved a lot of money doing so.
[A]: Carl

[Q]: Sentence1: Maria was supposed to pay her water bill one day. Sentence2: She didn't make it into the office before they closed. Sentence3: Instead she went in first thing the next morning. Sentence4: Unfortunately they had to charge her a late fee. Sentence5: She argued at first but eventually gave up and just paid.
[A]:
Maria