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.

Ex Input:
Sentence1: Alex had a young son. Sentence2: The boy was three years old. Sentence3: He still wasn't speaking. Sentence4: Alex told the doctor about his speech issue. Sentence5: Alex's son started to see a speech therapist.

Ex Output:
Speech therapist, Alex, Young son, Doctor

Ex Input:
Sentence1: A strange lady walked into the club. Sentence2: She flirted with any man in sight and was asking for free drinks. Sentence3: Due to her behavior, the security guards came. Sentence4: They escorted her to the front of the club. Sentence5: She tried fighting back but she couldn't get inside the club again.

Ex Output:
Security guards, Strange lady, Any man

Ex Input:
Sentence1: Gina's cousin and her sister were on the porch talking. Sentence2: Gina was in the house helping her grandma make dinner. Sentence3: At first she felt sad she didn't fit in with the other girls. Sentence4: She decided to focus on the cooking instead of them. Sentence5: After 45 minutes she had forgotten they were there.

Ex Output:
Cousin, Her sister, Gina, Grandma