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 man in black shirt laying on bed with a teddy bear'. Replace the letter 'd' with 'b' in the sentence.
Example Output: a man in black shirt laying on beb with a tebby bear

Example Input: Sentence: 'an old man wearing glasses is looking at the camera'. Replace the letter 'w' with 'c' in the sentence.
Example Output:
an old man cearing glasses is looking at the camera