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: A child is window shopping for a brown purse.
Hypothesis: A child is shopping to complete their outfit
Update: Tomorrow is her mother's birthday.
Example Output: weakener

Example Input: Premise: Two women stand in the foreground making foolish faces in front of a diverse crowd of young people.
Hypothesis: Two teachers are making funny faces at their students.
Update: The people are in a classroom.
Example Output: strengthener

Example Input: Premise: People watch as a bunch of boys stand around and perhaps hold still a large pole.
Hypothesis: The boys are playing tetherball.
Update: There is a ball attached to the pole.
Example Output:
strengthener