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.

Input: Consider Input: Premise: Two boys playing on a trampoline.
Hypothesis: Two boys playing chess on a trampoline.
Update: There is a checkered board on top of the trampoline.

Output: strengthener


Input: Consider Input: Premise: An African American man smiling.
Hypothesis: The man is showing his teeth to a doctor.
Update: The man is knocking on a door

Output: weakener


Input: Consider Input: Premise: Three children, two girls and one boy, in martial art stances, standing on the hard-wood floor of a large room.
Hypothesis: Children are inside wearing comfortable white pants and tops.
Update: They're practicing at home.


Output: weakener