TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a fire hydrant and a rolled up fire hose'. Replace the letter 'd' with 's' in the sentence.

SOLUTION: a fire hysrant ans a rolles up fire hose

PROBLEM: Sentence: 'a single person is working in the cluttered kitchen'. Replace the letter 'n' with 'e' in the sentence.

SOLUTION: a siegle persoe is workieg ie the cluttered kitchee

PROBLEM: Sentence: 'the clock towers over the rest of the city'. Replace the letter 'r' with 'n' in the sentence.

SOLUTION:
the clock towens oven the nest of the city