Rank these four national parks in terms of popularity.
Grand Canyon National Park, Rocky Mountain National Park, Yosemite National Park, Great Smoky Mountains National Park
1. Great Smoky Mountains National Park
2. Grand Canyon National Park
3. Yosemite National Park
4. Rocky Mountain National Park
Complete the following task based on the instruction and optional input provided.### Instruction:
Rank these four national parks in terms of popularity.

### Input:
Grand Canyon National Park, Rocky Mountain National Park, Yosemite National Park, Great Smoky Mountains National Park

### Output:
1. Great Smoky Mountains National Park
2. Grand Canyon National Park
3. Yosemite National Park
4. Rocky Mountain National Park