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 city block is sealed off by the police.
Hypothesis: People can not access the city block.
Update: The block is completely empty and there are policemen guarding barriers around the block.

Ex Output:
strengthener


Ex Input:
Premise: Bikini-clad female at the beach doing a cartwheel.
Hypothesis: There is a woman near the water.
Update: Her feet land in the water.

Ex Output:
strengthener


Ex Input:
Premise: Construction workers work on a road into the night.
Hypothesis: Construction workers decided to work at night when there was less traffic.
Update: They are wearing lights on their heads.

Ex Output:

strengthener