In this task, you are given two natural language statements with similar wording. You must choose the statement that makes less sense based on common sense knowledge. A '
' separates the statements. Use "first" or "second" to indicate which sentence makes less sense.

Let me give you an example: A mosquito stings me
I sting a mosquito
The answer to this example can be: second
Here is why: The second statement doesn't make sense.

OK. solve this:
grass can stain clothes
grass can clean clothes
Answer:
second