In this task, you need to replace a letter in the sentence with another given letter.

Example Input: Sentence: 'a motorcycle that is in front of a car'. Replace the letter 'r' with 'p' in the sentence.
Example Output: a motopcycle that is in fpont of a cap

Example Input: Sentence: 'a rare picture of an individual within this image'. Replace the letter 'd' with 'z' in the sentence.
Example Output: a rare picture of an inzivizual within this image

Example Input: Sentence: 'a cluttered desk with a coffee mug is topped off by an antiquated computer'. Replace the letter 'c' with 'k' in the sentence.
Example Output:
a kluttered desk with a koffee mug is topped off by an antiquated komputer