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.

Premise: An old man is sitting on a stoop while people walk towards him with groceries.
Hypothesis: A man sits enjoying the weather, as shoppers stroll by with groceries.
Update: The old man is wearing a sweater, overcoat, scarf and mittens.
strengthener

Premise: A boy wearing blue shorts is doing a back flip in the air under a tree.
Hypothesis: A boy is doing back flips outdoors
Update: The tree is in the local park
strengthener

Premise: A man playing a guitar and a man playing drums
Hypothesis: One man playing the guitar while another plays the drums at a live music event.
Update: The two men need professional amplifiers to be heard over the applause.

strengthener