TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a suitcase is sitting on a sidewalk near trees'. Replace the letter 's' with 'd' in the sentence.

SOLUTION: a duitcade id ditting on a didewalk near treed

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: 'the two cats are setting on the bathroom vanity'. Replace the letter 't' with 'o' in the sentence.

SOLUTION:
ohe owo caos are seooing on ohe baohroom vanioy