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: It was early December. Sentence2: My mom had been fighting cancer. Sentence3: She knew her time was near. Sentence4: She promised she would look after me in heaven. Sentence5: She died in her sleep.

Output: I (myself), My mom

Input: Consider Input: Sentence1: Carlos always loved being near the water. Sentence2: His friend invited him to go sailing one day. Sentence3: Carlos and his friend spent the entire day sailing. Sentence4: It was a great day. Sentence5: Carlos was happy that he had spent the day on the water.

Output: Friend, Carlos

Input: Consider Input: Sentence1: Melody and Johnny bounded excitedly down the stairs on Christmas Day. Sentence2: Mom and dad followed with huge smiles on their faces. Sentence3: Santa had paid a visit, the tree was loaded with gifts under it. Sentence4: The children played endlessly all day long with their new toys. Sentence5: Mom tucked them in bed with prayers for a new year about to begin.
Output: Dad, Santa, Melody, Mom, Johnny