Given Sentence 1 and Sentence 2, indicate your answer as yes when the two sentences clearly agree or clearly disagree with each other. If the relationship cannot be determined, answer with 'no'.

Let me give you an example: A boy in a blue jacket rides a skateboard down the street. <sep> A blue jacketed boy is standing in football field.
The answer to this example can be: yes
Here is why: This answer is yes because the boy can either be riding or standing but not both. Since the statements disagree, the answer is yes.

OK. solve this:
A person sweeping stairs in a park. <sep> A person outside.
Answer:
yes