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.

Sentence1: Tom was in the shower. Sentence2: He heard someone knocking at the door. Sentence3: He rushed to the door. Sentence4: He only had a small towel. Sentence5: He was embarrassed but answered the door.
Someone, Tom

Sentence1: Kim was a clumsy girl. Sentence2: She slipped on a banana peel. Sentence3: She hurt her head. Sentence4: She got stitches at the doctors. Sentence5: Kim was much more careful after that.
Kim, Doctors

Sentence1: Ana met her high school BFF after eleven years! Sentence2: She saved his number in her phone right away. Sentence3: Then, that night, she dropped the phone in her pool! Sentence4: Luckily, though, the next day her old friend called HER! Sentence5: She explained what happened-he gave her his number again, laughing!
Ana, Her high school bff