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.

Q: 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.

A: strengthener
****
Q: Premise: A bird's eye view of people walking up and down cement steps, most in silhouette except for two little girls.
Hypothesis: The girls are best friends.
Update: The girls are arguing.

A: weakener
****
Q: Premise: three men look at a sign.
Hypothesis: Three men are looking at something on the sidewalk
Update: The sign is high in the air.

A:
weakener
****