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: Tina wanted to save one hundred dollars for a vacation. Sentence2: She was really broke. Sentence3: She decided to open up a savings account. Sentence4: Every month she took 25 dollars out of her check. Sentence5: In four months she could pay for her vacation!
Output:
Tina