Rank the following countries in terms of population size from largest to smallest.
Japan, India, USA
According to data from the United Nations, in 2021 the ranking of the countries in terms of population size from largest to smallest is as follows: 

1. India 
2. USA
3. Japan
Complete the following task based on the instruction and optional input provided.### Instruction:
Rank the following countries in terms of population size from largest to smallest.

### Input:
Japan, India, USA

### Output:
According to data from the United Nations, in 2021 the ranking of the countries in terms of population size from largest to smallest is as follows: 

1. India 
2. USA
3. Japan