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 parents sit on a couch while a girl in a pink sweater lounges across them.
Hypothesis: The two parents are married.
Update: The parents' children have different last names.
Example Output: weakener

Example Input: Premise: The sky appears clear.
Hypothesis: The sky looked very clear at night.
Update: Many stars are visible.
Example Output: strengthener

Example Input: Premise: People with umbrellas walking in the rain.
Hypothesis: Some people in the cold rain.
Update: People are wearing shorts and tank tops.
Example Output:
weakener