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.

Example Input: Premise: A group of young girls hold hands while wearing colorful skirts while other women dance and smile around them with two men discussing something in the background.
Hypothesis: The girls are friends.
Update: The girls introduce themselves to each other.
Example Output: weakener

Example Input: Premise: Two football teams lined up before the hike.
Hypothesis: Two football teams line up during the superbowl for the hike.
Update: Ad time at the event is absurdly expensive.
Example Output: strengthener

Example Input: Premise: A man in a hard hat stands beside a ladder.
Hypothesis: Construction worker about to climb a ladder to fix an electrical problem.
Update: The worker is carrying a roll of electrical cable.
Example Output:
strengthener