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

[Q]: Sentence: 'a fire fighter climbs onto the roof of a market with a ladder'. Replace the letter 'r' with 'k' in the sentence.
[A]: a fike fightek climbs onto the koof of a makket with a laddek


[Q]: Sentence: 'a photo of a river with a train bridge across it'. Replace the letter 'r' with 'f' in the sentence.
[A]: a photo of a fivef with a tfain bfidge acfoss it


[Q]: Sentence: 'a cat sits on the keyboard of a laptop'. Replace the letter 'r' with 'f' in the sentence.
[A]:
a cat sits on the keyboafd of a laptop