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 young african boy skipping rocks.
Hypothesis: There is a rock currently skipping down a pond.
Update: There are several expanding sets of rings on the surface of the pool.

Ex Output:
strengthener


Ex Input:
Premise: A white-haired older man in a green striped shirt is conducting in the social sciences building.
Hypothesis: A white-haired older man in a green striped shirt and black pants is conducting in the social sciences building.
Update: The man is dressed in semi-formal clothing.

Ex Output:
strengthener


Ex Input:
Premise: A young brunette girl wearing a Toronto Maple Leaf shirt is posing with a hockey stick and puck.
Hypothesis: The young girl is a hockey player.
Update: The girl is standing on skates on the rink.

Ex Output:

strengthener