The conversation between human and AI assistant.
[|Human|] Rewrite the following sentence so that it does not contain the word "expensive":
"Sunglasses can be an expensive accessory"
[|AI|] Sunglasses can be a costly accessory.
[|Human|] 
Rewrite the following sentence so that it does not contain the word "expensive":
"Sunglasses can be an expensive accessory"