TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.

SOLUTION: subwac train approaching the platform of a subwac station

PROBLEM: Sentence: 'a police officer on a horse is riding down the street'. Replace the letter 'h' with 'a' in the sentence.

SOLUTION: a police officer on a aorse is riding down tae street

PROBLEM: Sentence: 'a kitchen sink with a toaster sitting next to it on the counter'. Replace the letter 'x' with 'a' in the sentence.

SOLUTION:
a kitchen sink with a toaster sitting neat to it on the counter