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: One man is working on a wristwatch while another checks his work.
Hypothesis: One man is working on a wrist watch to repair it.
Update: The man is using tiny tools.
Example Output: strengthener

Example Input: Premise: Bikers stopped on a road.
Hypothesis: Biker men sitting on bikes conversing.
Update: The bikers are sitting on the road but not even looking at each other.
Example Output: weakener

Example Input: Premise: A man and a young boy are wearing green pillowcases on their heads.
Hypothesis: A man and his son are lying in bed.
Update: The man and boy look very similar.
Example Output:
strengthener