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

Example Input: Sentence: 'a woman in a dining-room holding a knife, cutting a cake on the table'. Replace the letter 'i' with 'p' in the sentence.
Example Output: a woman pn a dpnpng-room holdpng a knpfe, cuttpng a cake on the table

Example Input: Sentence: 'a box of a dozen doughnuts all varieties'. Replace the letter 'l' with 'i' in the sentence.
Example Output: a box of a dozen doughnuts aii varieties

Example Input: Sentence: 'there are several clocks that look like they are hanging from the ceiling'. Replace the letter 'k' with 'v' in the sentence.
Example Output:
there are several clocvs that loov live they are hanging from the ceiling