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 young boy with short blond-hair and a blue sweater taking a picture.
Hypothesis: A child is a pro photographer
Update: A child is a proven photographer.
Example Output: strengthener

Example Input: Premise: This is a man walking near a busy street.
Hypothesis: The man is walking because they don't have a car.
Update: The man is walking to increase the number of steps monitored by his activity device.
Example Output: weakener

Example Input: Premise: A man is kicking another man in the head inside of a red ring while another man watches.
Hypothesis: Tall humans kicking
Update: The men are over 6 feet tall.
Example Output:
strengthener