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: Lou was checking out a new number blocking feature on his phone. Sentence2: Unfortunately, the number he blocked was somehow permanently blocked. Sentence3: No matter what he did, he couldn't get the number to be unblocked. Sentence4: He eventually had to call the company to remedy the situation. Sentence5: He was embarrassed, having to tell his neighbor why she couldn't call.
Output:
Neighbor, Lou