Sort the following list of steps by order.
- Add flour 
- Turn on the oven
- Grease the baking pan
- Pour milk
1. Turn on the oven
2. Grease the baking pan
3. Add flour
4. Pour milk
Complete the following task based on the instruction and optional input provided.### Instruction:
Sort the following list of steps by order.

### Input:
- Add flour 
- Turn on the oven
- Grease the baking pan
- Pour milk

### Output:
1. Turn on the oven
2. Grease the baking pan
3. Add flour
4. Pour milk