instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a couple of brown bears walking across a lush green field'. Replace the letter 'w' with 'o' in the sentence.
answer:
a couple of broon bears oalking across a lush green field


question:
Sentence: 'two tennis players shaking hands across the net'. Replace the letter 't' with 's' in the sentence.
answer:
swo sennis players shaking hands across she nes


question:
Sentence: 'a young man who is riding on a skateboard riding down the street'. Replace the letter 'n' with 's' in the sentence.
answer:

a yousg mas who is ridisg os a skateboard ridisg dows the street