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

[EX Q]: Sentence: 'a yellow street sign sitting on the side of a road'. Replace the letter 'a' with 'd' in the sentence.
[EX A]: d yellow street sign sitting on the side of d rodd

[EX Q]: Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.
[EX A]: a couplp of ppoplp that arp pptting a horsp

[EX Q]: Sentence: 'traffic on the highway heads under street signs'. Replace the letter 'i' with 'r' in the sentence.
[EX A]:
traffrc on the hrghway heads under street srgns