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

[EX Q]: Sentence: 'a bunch of signs on a pole on the street'. Replace the letter 'c' with 's' in the sentence.
[EX A]: a bunsh of signs on a pole on the street

[EX Q]: Sentence: 'a mouse and keyboard sitting on a wooden desk'. Replace the letter 'a' with 'n' in the sentence.
[EX A]: n mouse nnd keybonrd sitting on n wooden desk

[EX Q]: Sentence: 'the surfer with red pants and grey top rides the wave atop the white surfboard'. Replace the letter 'd' with 't' in the sentence.
[EX A]:
the surfer with ret pants ant grey top rites the wave atop the white surfboart