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

[Q]: Sentence: 'some brown black and white horses clouds and rocks'. Replace the letter 'a' with 'n' in the sentence.
[A]: some brown blnck nnd white horses clouds nnd rocks


[Q]: Sentence: 'a man is ordering food from a mobile food truck'. Replace the letter 'r' with 'q' in the sentence.
[A]: a man is oqdeqing food fqom a mobile food tquck


[Q]: Sentence: 'some street signs in front of a street light and a building'. Replace the letter 'u' with 'f' in the sentence.
[A]:
some street signs in front of a street light and a bfilding