Instructions: 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: Sentence1: One day I had $4 cash in my wallet. Sentence2: I decided to buy four $1 lottery tickets at the gas station. Sentence3: I waited for the lottery drawing. Sentence4: I matched enough numbers on one ticket to win a $4 prize. Sentence5: I took the ticket back to the gas station and got my $4 back.
Output:
I (myself)