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

Example Input: Sentence: 'a clean, sterile bathroom with a shower, toilet, and sink'. Replace the letter 'n' with 'k' in the sentence.
Example Output: a cleak, sterile bathroom with a shower, toilet, akd sikk

Example Input: Sentence: 'a teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.
Example Output: a temmy bear playing a mrum anm a temmy bear playing a guitar

Example Input: Sentence: 'a table with bananas, apples, bread, and salt'. Replace the letter 'a' with 'n' in the sentence.
Example Output:
n tnble with bnnnnns, npples, brend, nnd snlt