Identify which of the following materials are insulators.
wood, rubber, metal
Out of the materials you mentioned: wood and rubber are insulators while metal is a conductor.
Complete the following task based on the instruction and optional input provided.### Instruction:
Identify which of the following materials are insulators.

### Input:
wood, rubber, metal

### Output:
Out of the materials you mentioned: wood and rubber are insulators while metal is a conductor.