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 busy intersection with cars moving at night'. Replace the letter 's' with 'f' in the sentence.

SOLUTION: a bufy interfection with carf moving at night

PROBLEM: Sentence: 'the fountain is the centerpiece in the  park'. Replace the letter 'e' with 'i' in the sentence.

SOLUTION:
thi fountain is thi cintirpiici in thi  park