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

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 large clock tower next to a building on a street'. Replace the letter 'c' with 'n' in the sentence.
Example Output: a large nlonk tower next to a building on a street

Example Input: Sentence: 'a twin sized bed with rich red sheets in a room'. Replace the letter 'i' with 'z' in the sentence.
Example Output:
a twzn szzed bed wzth rzch red sheets zn a room