Arrange the following countries in descending order of population size.
Australia, China, Brazil
The following countries arranged in descending order of population size would be: China, Brazil, Australia.
Complete the following task based on the instruction and optional input provided.### Instruction:
Arrange the following countries in descending order of population size.

### Input:
Australia, China, Brazil

### Output:
The following countries arranged in descending order of population size would be: China, Brazil, Australia.