instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a couple sits on a bench in the countryside'. Replace the letter 'y' with 'k' in the sentence.
answer:
a couple sits on a bench in the countrkside

question:
Sentence: 'someone playing frisbee with a dog in the middle of a court'. Replace the letter 'd' with 'r' in the sentence.
answer:
someone playing frisbee with a rog in the mirrle of a court

question:
Sentence: 'the birds are flying low over the water'. Replace the letter 'e' with 'i' in the sentence.
answer:
thi birds ari flying low ovir thi watir