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: Betty's friend was very thoughtful and often sent her gifts. Sentence2: One time she sent her flower bulbs to grow indoors. Sentence3: Betty planted her bulbs and was excited to see what they'd look like. Sentence4: They bloomed into beautiful flowers, but smelled sickeningly sweet. Sentence5: Betty couldn't tolerate the smell and had to toss the flowers outside.
A:
Betty, Betty's friend