The RTFM Challenge

Very Easy50 pts0 solves
A developer copies a prompt from a blog post and uses it with Claude. It doesn't work. He switches to GPT. Still bad results. He finally reads the official provider docs and fixes it in 5 minutes. What should you always read first before prompting a new model? Flag format: CONGRESS{[what_to_read]} Example: CONGRESS{stackoverflow}
Hint
The answer is in the question. Every model has official guides.