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 man standing in a white shirt is conducting a small group of violin players.
Hypothesis: Bob is conducting a small group.
Update: The man's birth certificate says Robert.

A: strengthener
****
Q: Premise: There is a row of red and white bikes all in a bike rack.
Hypothesis: The bikes are each brightly painted red and white.
Update: Brand new bikes are on display at a bike shop.

A:
strengthener
****