Given the task definition and input, reply with output. 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: My sister in law was angry at her granddaughter B. Sentence2: B had gone to a 50 Cent concert and did not tell her grandmother. Sentence3: I thought it was a little odd to take your grandmother out. Sentence4: I bought my sister in law a 50 Cent cd for her birthday. Sentence5: She was happy to get that but is still angry at B.
I (myself), Sister in law, B, 50 cent