Given a list of cities, classify each city as either a developed or developing city.
Sydney, Rio de Janeiro, Cairo
Sydney is a developed city.
Rio de Janeiro is a developing city.
Cairo is a developing city.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Given a list of cities, classify each city as either a developed or developing city.

### Response:
Sydney is a developed city.
Rio de Janeiro is a developing city.
Cairo is a developing city.