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: Lou's dad went fishing with his friends one Saturday a month. Sentence2: Lou always asked to go along but his dad said he was too little. Sentence3: Then one day, Lou's dad said he could go! Sentence4: He and his dad went out on a boat with fishing poles. Sentence5: He was very excited when he caught his first fish that day.

Output: His dad, Friends, Lou

Input: Consider Input: Sentence1: Waiting for the next train to pull up, Harry was nervous. Sentence2: He was only a few hours away from his big interview. Sentence3: Spending the last three months sending out resumes, this was it. Sentence4: Boarding the train, he noticed something strange about the inside. Sentence5: He had hopped on the wrong color train, and would be late.

Output: Harry

Input: Consider Input: Sentence1: Smitty felt a bit off after a spell of illness. Sentence2: He thought that might be because he wasn't getting enough sleep. Sentence3: He decided to take a sleeping pill or two that night. Sentence4: Come bed time Smitty took two low-dose sleeping pills. Sentence5: He slept that night like a baby, and woke up feeling great.
Output: Smitty