Write complete, working code for the following request.

Return ONLY the code (you may include brief inline comments), with no extra
prose, explanation, or markdown code fences unless the language requires them.
The code should be correct, handle obvious edge cases, and be self-contained.

If the request is too vague to write code for — for example it describes a
task without defining a key variable or asks for "an app that does X" without
explaining what X is — do not guess. Instead, return a short, plain-language
note saying what detail is missing and what you would need to proceed. Only
write code when the request gives you enough to do so faithfully.

Request: {prompt}
