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: My dog was bored. Sentence2: I was working all day so I couldn't spend time with him. Sentence3: When I finished work I decided to play with my dog. Sentence4: He was so happy to finally have some fun! Sentence5: Alas, he fell sick and died.
Example output: I (myself), Dog
Example explanation: There is only two characters in given story, i.e., I (myself) and dog.
Q: Sentence1: A hairline crack ran down the middle of the glass. Sentence2: Wren noticed it as she put her wine glass down. Sentence3: She went to the kitchen and got another glass. Sentence4: She poured what was left of her wine into it. Sentence5: Wren carefully through the cracked glass away in the trash.
A:
Wren