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: Diana sacrificed her sleep to study for her math exam. Sentence2: At one moment, she fell asleep on her table. Sentence3: Diana's mom woke her up in the morning. Sentence4: Diana got mad when she found out that she's late to her exam. Sentence5: She also missed it since there was several traffic on the road.
Example Output: Diana, Diana's mom

Example Input: Sentence1: Ann had never been involved in politics until this year. Sentence2: When her political party asked her to volunteer, she hesitated. Sentence3: Though shy, she felt the election was too important not to help. Sentence4: Her friends were surprised Ann became an effective door knocker. Sentence5: Given courage by her beliefs, Ann inspired others to get involved.
Example Output: Ann, Friends, Political party

Example Input: Sentence1: My dog died last year from old age. Sentence2: He was buried under a huge pink rose bush. Sentence3: We buried him inside his favorite carrier, a red one. Sentence4: We placed a professionally made stone on his grave. Sentence5: The inscription said he was a dog with the heart of a lion.
Example Output:
I (myself), Dog