You will be given a definition of a task first, then some input of the task.
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: Betsy has always loved watching birds. Sentence2: She decides to buy a bird feeder and put it outside her window. Sentence3: Soon she sees many birds, including blue jays and finches. Sentence4: She finds that watching birds is calming and nice. Sentence5: Betsy is very happy that she can watch birds every day.
Output:
Betsy, Birds