instruction:
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.
question:
Premise: Four people wearing red, blue, white& black, walking up a white staircase overlooking a marina in an old city.
Hypothesis: The group of people are all part of a party.
Update: They are returning children on Halloween who wore matching costumes while trick or treating.
answer:
weakener


question:
Premise: A surfer rides his surfboard at the start of a wave.
Hypothesis: There are several people surfing on big waves.
Update: The surfer worries that nobody will see him fall.
answer:
weakener


question:
Premise: Surfers in swimming trunks riding waves on their surfboards in the blue ocean.
Hypothesis: Some friends take surfing lessons on vacation.
Update: The is a warning sign on the beach saying not to go into the water.
answer:

weakener