TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a red hydrant is sitting on the sidewalk in the city'. Replace the letter 'n' with 'r' in the sentence.

SOLUTION: a red hydrart is sittirg or the sidewalk ir the city

PROBLEM: Sentence: 'a baseball player swings his bat at a pitch'. Replace the letter 's' with 'l' in the sentence.

SOLUTION: a baleball player lwingl hil bat at a pitch

PROBLEM: Sentence: 'a man riding a wave on a surfboard in the ocean'. Replace the letter 'h' with 'k' in the sentence.

SOLUTION:
a man riding a wave on a surfboard in tke ocean