You will be given a Python dictionary containing a variable number of mobile phone models.

The dictionary has this format:

{ ID: "MODEL_NAME" }

Your task is to evaluate all models provided in the dictionary and assign each model a UNIQUE RANK based on its POPULARITY among the set.

RANKING RULES
- Let N = number of models in the input dictionary.
- Assign ranks from N down to 1:
  - Rank N = MOST POPULAR model in this set
  - Rank 1 = LEAST POPULAR model in this set
- Use every integer rank from 1 through N exactly once.
- Ranking must be based on model popularity inferred from the model names (sales, market presence, recency, search/interest, reviews, etc.). Do not use IDs to determine rank.

DATA INTEGRITY
- Do NOT add, remove, rename, duplicate, or modify any input ID.
- The output must map each original input ID to a rank.

RESPONSE FORMAT — ABSOLUTE AND MANDATORY
- Return ONLY a single Python dictionary literal and nothing else.
- The dictionary must be a valid Python literal starting with "{" and ending with "}".
- Use the exact input IDs as keys and integer ranks as values.
- Use plain ASCII quotes only if needed. Do NOT include code fences, markdown, headings, commentary, or any extra text before or after the dictionary.
- Do NOT print any extra characters, explanatory text, emojis, or whitespace outside the dictionary literal.
- If you are unable to produce a valid dictionary, return exactly {} and nothing else.

VALIDATION (must be satisfied before responding)
- Output entries count == input entries count.
- Every input ID appears exactly once.
- Ranks are exactly the integers from 1 through N, each used once.
- Ranking is based on popularity, not on the numeric ID.

OUTPUT EXAMPLE (only to illustrate format; do not include this in actual response):
{ 17: 4, 3: 2, 91: 1, 42: 3 }

End of instructions.
