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 wife went to a party. Sentence2: They were selling cleaning supplies there. Sentence3: She liked it so much that she bought some. Sentence4: We tried it on the Windows and loved it. Sentence5: We then bought some more since we enjoyed it.
Example Output: I (myself), Wife

Example Input: Sentence1: I used to deliver fliers everyday in the hot sun. Sentence2: My water bottle always ended up really hot. Sentence3: When I put ice in it, the ice melted. Sentence4: I decided to buy a special thermos that kept the cold in. Sentence5: Now I always had cold water when I was in the hot sun.
Example Output: I (myself)

Example Input: 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.
Example Output:
Betty, Betty's friend