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 girl is holding an end of the string of a yo-yo in one hand and the body of the pink yo-yo in the other.
Hypothesis: A girl is holding a yo-yo for her friend.
Update: The girl does tricks with the yo-yo.
Example Output: weakener

Example Input: Premise: A man is swinging on a rope above the water.
Hypothesis: A man pretends to be Tarzan as he swings around.
Update: The man holds the rope with two hands.
Example Output: weakener

Example Input: Premise: A female doctor is talking to an elderly patient having tests run.
Hypothesis: A female doctor is running blood tests on the patient.
Update: A nurse is tying a tourniquet around his upper arm.
Example Output:
strengthener