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.

Input: Consider Input: Sentence1: Carl needed to lose weight. Sentence2: He found it very hard since he loved candy. Sentence3: He decided he would stop having candy in the house. Sentence4: He found it much easier to lose weight this way. Sentence5: Soon, Carl was down ten pounds and didn't miss eating candy at all.

Output: Carl

Input: Consider Input: 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.

Output: Simy, Grandpa, Mom, Grandma

Input: Consider Input: Sentence1: Teresa went for a hike. Sentence2: On the path, she saw a rattlesnake. Sentence3: She and the rattlesnake both froze. Sentence4: Finally, the rattlesnake moved on. Sentence5: Teresa never went hiking alone again.
Output: Teresa, Rattlesnake