In this task your given two statements. You must judge whether the second sentence is the cause or effect of the first one. Label the instances as "cause" or "effect" based on your judgment. The sentences are separated by a newline character.

Example Input: I felt exhausted.
I studied all day.
Example Output: cause

Example Input: I learned how to play the board game.
My friend explained the rules to me.
Example Output: cause

Example Input: I rubbed sandpaper on the wood.
The wood became smooth.
Example Output:
effect