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 boy in a swimsuit walking in the sand towards the water
Hypothesis: A boy in a swimsuit happily walking
Update: The boy laughs as he walks along.

Ex Output:
strengthener


Ex Input:
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.

Ex Output:
weakener


Ex Input:
Premise: Three guys, with electric guitars playing at a benefit concert, the lead singer is wearing sunglasses and green tennis shoes.
Hypothesis: guys play rock music
Update: The guys play the guitars fast and loud.

Ex Output:

strengthener