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

[Q]: Sentence: 'a red train moves over snowy rail road tracks'. Replace the letter 'v' with 'w' in the sentence.
[A]: a red train mowes ower snowy rail road tracks


[Q]: Sentence: 'a large clock tower next to a building on a street'. Replace the letter 'c' with 'n' in the sentence.
[A]: a large nlonk tower next to a building on a street


[Q]: Sentence: 'a box filled with various types of donuts'. Replace the letter 'r' with 'v' in the sentence.
[A]:
a box filled with vavious types of donuts