This scenario is an example of punishment. Specifically, it is an example of negative punishment - the removal of a desirable stimulus, (recess break), in order to decrease the likelihood of the behavior (failing to complete the assigned task) occurring again.
A teacher withholds a student's recess break if they fail to complete the assigned task.
### Instruction:
Classify this scenario as an example of reinforcement or punishment.

### Input:
A teacher withholds a student's recess break if they fail to complete the assigned task.

### Response:
