Detailed Instructions: 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.
Q: Sentence1: When I woke up this morning I was greeted by the sound of birds. Sentence2: Birds often sing in the tree outside my bedroom window. Sentence3: The difference for me is that today I had time to listen. Sentence4: I lay in bed much longer than usual because it is Saturday. Sentence5: Listening to birds in the morning makes me happy.
A:
I (myself), Birds