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.

Ex Input:
Premise: A mama bear and its cub are growling directly at one another.
Hypothesis: A mama bear confronts her cub over food.
Update: There is a piece of meat between the bear and the cub.

Ex Output:
strengthener


Ex Input:
Premise: two girls sit on a large rock.
Hypothesis: Two sisters pose for a picture on their favorite rock.
Update: The girls are having lunch on a picnic during a vacation in a country they've never seen.

Ex Output:
weakener


Ex Input:
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.

Ex Output:

weakener