Categorize the following items into two lists according to their properties.
silver spoon, wooden spoon, rocks
Metal items:
- Silver spoon

Non-metal items:
- Wooden spoon
- Rocks
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following items into two lists according to their properties.

### Input:
silver spoon, wooden spoon, rocks

### Output:
Metal items:
- Silver spoon

Non-metal items:
- Wooden spoon
- Rocks