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: Brad had just recently got a new kitty. Sentence2: His cat was just beginning to develop into an adult. Sentence3: When brad came home from work he screamed when he walked in his house. Sentence4: His cat had brought in a dead bird. Sentence5: Brad cleaned up the bloody mess.
Bird, Brad