In this task, you need to replace a letter in the sentence with another given letter.

Example Input: Sentence: 'a boy is sitting at a dinner table with his food'. Replace the letter 't' with 'r' in the sentence.
Example Output: a boy is sirring ar a dinner rable wirh his food

Example Input: 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.
Example Output: a ykier with hiy legy covered in ynow lifty one of hiy feet to ytamp it

Example Input: Sentence: 'an arrow shaped trolley pulls out from the corner of a kitchen cabinet'. Replace the letter 'b' with 'g' in the sentence.
Example Output:
an arrow shaped trolley pulls out from the corner of a kitchen caginet