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: My friend, Zach and I were playing video games yesterday. Sentence2: All of a sudden, the doorbell rang. Sentence3: Zach opened the door to find a pizza on the ground with a card. Sentence4: On the card was a message thanking my friend. Sentence5: His neighbor left it for him because Zach had helped him move earlier.
Output:
I (myself), Neighbor, Zach