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: Man on roof touching a shingle.
Hypothesis: Human on top of bulding grabbing a shingle.
Update: The man moves his hands over to the chimney and hangs onto it.
Example Output: weakener

Example Input: Premise: A group of people in business casual clothes sitting on blue chairs arranged in a circle around a laptop.
Hypothesis: The people are in a circle to perform a meeting.
Update: The people are in a circle to collectively search for better jobs.
Example Output: weakener

Example Input: Premise: A female gymnasium in a blue leotard getting hugged by someone else in a blue jacket and black pants.
Hypothesis: The two people know one another.
Update: The woman shakes the person's hand after the hug.
Example Output:
strengthener