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

[Q]: Sentence: 'an old rusty car sits outside of an old building'. Replace the letter 'o' with 'r' in the sentence.
[A]: an rld rusty car sits rutside rf an rld building


[Q]: Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.
[A]: b dog lbying in front of b horses stbll with the horse peeking over the hblf door


[Q]: Sentence: 'a sign and a group of cows on a large grass field'. Replace the letter 'f' with 'm' in the sentence.
[A]:
a sign and a group om cows on a large grass mield