TASK DEFINITION: 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.
PROBLEM: Premise: Middle-age students sitting in rows of tables listening to a teacher sitting in front of room behind desk.
Hypothesis: The teacher is teaching the students about classic literature.
Update: Math problems are written on the chalkboard.

SOLUTION: weakener

PROBLEM: Premise: Little boy in black jacket, kicking leaves.
Hypothesis: A child is happily playing in the leaves.
Update: His face is sullen.

SOLUTION: weakener

PROBLEM: Premise: Two kids playing in a yard with some farm animals.
Hypothesis: Children playing with chickens.
Update: the animals make chirping sounds while they bob on two legs

SOLUTION:
strengthener