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

[EX Q]: Sentence: 'a couple walking down a sidewalk next to some graffiti'. Replace the letter 'a' with 'y' in the sentence.
[EX A]: y couple wylking down y sidewylk next to some gryffiti

[EX Q]: Sentence: 'a man that is jumping a skateboard over something'. Replace the letter 'g' with 'j' in the sentence.
[EX A]: a man that is jumpinj a skateboard over somethinj

[EX Q]: Sentence: 'a large group of white sheep eating grass'. Replace the letter 'i' with 'r' in the sentence.
[EX A]:
a large group of whrte sheep eatrng grass