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

Example Input: Sentence: 'a study features the color green and old-fashioned furniture'. Replace the letter 'e' with 'd' in the sentence.
Example Output: a study fdaturds thd color grddn and old-fashiondd furniturd

Example Input: Sentence: 'a bed with white comforter and two black stiletto heels'. Replace the letter 'h' with 's' in the sentence.
Example Output: a bed wits wsite comforter and two black stiletto seels

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