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.

Example Input: a butterfly used to be an egg
a butterfly used to be a caterpillar
Example Output: first

Example Input: I put my teacher into my backpack after class
I put my computer into my backpack after class
Example Output: first

Example Input: We can't know a book if we don't read it.
We can know a book by reading it.
Example Output:
first