instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a dog with his tongue out riding on a skateboard'. Replace the letter 's' with 'b' in the sentence.
answer:
a dog with hib tongue out riding on a bkateboard

question:
Sentence: 'a couple walking down a sidewalk next to some graffiti'. Replace the letter 'a' with 'y' in the sentence.
answer:
y couple wylking down y sidewylk next to some gryffiti

question:
Sentence: 'a chocolate cake with a slice cut out of it'. Replace the letter 'c' with 'j' in the sentence.
answer:
a jhojolate jake with a slije jut out of it