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 team prepares to play football.
Hypothesis: A team is running laps to warm up to play ball.
Update: The team is on a track.
Example Output: strengthener

Example Input: 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.
Example Output: strengthener

Example Input: Premise: Two men performing a piece of music, one in a plaid shirt singing into a microphone and the other in all black strumming an acoustic guitar.
Hypothesis: The man is singing a country song.
Update: The men are wearing cowboy hats and riding boots.
Example Output:
strengthener