TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a dog wearing a pink life jacket sitting on a surf board in the ocean'. Replace the letter 'c' with 'y' in the sentence.

SOLUTION: a dog wearing a pink life jayket sitting on a surf board in the oyean

PROBLEM: Sentence: 'a double decker bus stopped outside a station on a street'. Replace the letter 'c' with 'y' in the sentence.

SOLUTION: a double deyker bus stopped outside a station on a street

PROBLEM: Sentence: 'a man and a child skiing down a mountain on a trail'. Replace the letter 'n' with 'm' in the sentence.

SOLUTION:
a mam amd a child skiimg dowm a moumtaim om a trail