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.

Example Input: Sentence1: I packed the family in the car and headed to the grocery store. Sentence2: I forgot my credit card at home, and didn't have any cash on me. Sentence3: We filled an entire cart with the food we needed for the week. Sentence4: We got to the register and couldn't pay. Sentence5: It was very embarrassing.
Example Output: I (myself), Family

Example Input: Sentence1: Tony decided to make lemonade the old-fashioned way. Sentence2: He brought out some lemons, water, and sugar. Sentence3: He squeezed the lemons until he thought his hands would fall off. Sentence4: He then added some water, and a generous amount of sugar. Sentence5: Tony tasted his lemonade and decided he wanted to be a chef someday.
Example Output: Tony

Example Input: Sentence1: Tommy was a lively three year old boy. Sentence2: He had a favorite toy that he always played with. Sentence3: One day his cousin came over and Tommy didn't want to share his toy. Sentence4: His mother was very upset and scolded Tommy. Sentence5: Tommy realized that he had to share and waited for his turn.
Example Output:
Cousin, Mother, Tommy