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

[Q]: Sentence: 'a small bird perched on some thin branches'. Replace the letter 'a' with 'f' in the sentence.
[A]: f smfll bird perched on some thin brfnches


[Q]: Sentence: 'two police officers riding horses down the street'. Replace the letter 'o' with 'd' in the sentence.
[A]: twd pdlice dfficers riding hdrses ddwn the street


[Q]: Sentence: 'a bus with no wheels parked on a gravel area in a grass field'. Replace the letter 'i' with 'x' in the sentence.
[A]:
a bus wxth no wheels parked on a gravel area xn a grass fxeld