instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a polar bear relaxing in a man-made pool'. Replace the letter 'r' with 'x' in the sentence.
answer:
a polax beax xelaxing in a man-made pool

question:
Sentence: 'a skier with his legs covered in snow lifts one of his feet to stamp it'. Replace the letter 's' with 'y' in the sentence.
answer:
a ykier with hiy legy covered in ynow lifty one of hiy feet to ytamp it

question:
Sentence: 'a very old wooden bench is surrounded by plants and woods'. Replace the letter 'o' with 'j' in the sentence.
answer:
a very jld wjjden bench is surrjunded by plants and wjjds