Organizing the items below into categories.
Key, Pen, Pencil, Eraser
Writing Instruments: 
- Pen
- Pencil

Stationery Items:
- Eraser

Miscellaneous Items: 
- Key
Complete the following task based on the instruction and optional input provided.### Instruction:
Organizing the items below into categories.

### Input:
Key, Pen, Pencil, Eraser

### Output:
Writing Instruments: 
- Pen
- Pencil

Stationery Items:
- Eraser

Miscellaneous Items: 
- Key