In this task, you are given a premise, a hypothesis, and an update. The premise sentence describes a real-world situation and is always assumed to be true. The hypothesis sentence describes an assumption or inference that you might make about that situation having read the premise. The update provides additional information about the situation that might weaken or strengthen the hypothesis. A weakener is a statement that weakens the hypothesis, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

Input: Consider Input: Premise: A young african boy skipping rocks.
Hypothesis: There is a rock currently skipping down a pond.
Update: There are several expanding sets of rings on the surface of the pool.

Output: strengthener


Input: Consider Input: Premise: A black and brown dog is running out of the surf.
Hypothesis: A dog is swimming excitedly.
Update: The dog swims with great enthusiasm out of the water.

Output: strengthener


Input: Consider Input: Premise: A musician performing during the world event concert held in a local church in the city of angels.
Hypothesis: A female musician is performing with her whole band.
Update: The musician performs alone on the stage.


Output: weakener