List the continents in alphabetical order.
1. Africa
2. Antarctica
3. Asia
4. Australia
5. Europe
6. North America
7. South America
Complete the following task based on the instruction and optional input provided.### Instruction:
List the continents in alphabetical order.

### Output:
1. Africa
2. Antarctica
3. Asia
4. Australia
5. Europe
6. North America
7. South America