TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a laptop computer attached to a large monitor'. Replace the letter 'a' with 'r' in the sentence.

SOLUTION: r lrptop computer rttrched to r lrrge monitor

PROBLEM: Sentence: 'this is a cute dog sticking his head out of the window of a red car'. Replace the letter 'e' with 'z' in the sentence.

SOLUTION: this is a cutz dog sticking his hzad out of thz window of a rzd car

PROBLEM: Sentence: 'a double decker bus driving down a street'. Replace the letter 'n' with 'c' in the sentence.

SOLUTION:
a double decker bus drivicg dowc a street