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.

Example Input: Premise: Two young men are skateboarding at a park near a large house.
Hypothesis: Two men are at a park together.
Update: The men are taking turns doing moves while watching the other and praising them.
Example Output: strengthener

Example Input: Premise: An elderly man uses his walking stick to poke into a hole in the ground.
Hypothesis: A guy sticks his wooden stick in the ground.
Update: The stick is vulnerable to termites.
Example Output: strengthener

Example Input: Premise: A young boy in a swimming suit sits in water.
Hypothesis: A boy is learning to swim.
Update: An instructor comes over to help him learn.
Example Output:
strengthener