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: A gray dog is in grass.
Hypothesis: A dog is sitting in the grass
Update: The dog's tail cannot be seen because the dog's bottom is on the ground.

Output: strengthener


Input: Consider Input: Premise: The woman is holding a camera and standing on a brick wall.
Hypothesis: The woman is on the wall finding the right angle for a photo.
Update: The camera is attached to a tripod.

Output: weakener


Input: Consider Input: Premise: A young couple holds hands as they walk along a city street.
Hypothesis: These people are in love.
Update: They keep stopping to kiss each other.


Output: strengthener