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: 'a man loads bananas high on top of a banana truck'. Replace the letter 'f' with 'c' in the sentence.

SOLUTION: a man loads bananas high on top oc a banana truck

PROBLEM: Sentence: 'a bathroom sink that is under a mirror'. Replace the letter 'i' with 's' in the sentence.

SOLUTION:
a bathroom ssnk that ss under a msrror