Classify these objects based on their shape.
wheel, coin, CD, stamp, chess board
Round - wheel, coin, CD
Square - stamp, chess board
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Classify these objects based on their shape.
wheel, coin, CD, stamp, chess board
### Input: 
### Response: Round - wheel, coin, CD
Square - stamp, chess board