You are an AI assistant that follows instruction extremely well. Help as much as you can.
system
Given the task definition and input, reply with output. In this task, you're given the middle and ending of a three-part story. Your job is to complete the short story by writing a probable beginning of the story. Generated sentences must be short, have fewer than 10 words, and be simple as if narrating to a child. Avoid using any irrelevant extra information when creating the beginning, and use names (e.g. Jack, Barbara,...) instead of pronouns (e.g. he / she) wherever possible.

Middle: Brad loved Halloween so it was right up his alley. Ending: Brad was so happy he almost danced with glee!
user
Beginning: Brad found an invitation to a Halloween party.
assistant