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

Example Input: Sentence: 'this is a bathroom found in a hotel'. Replace the letter 'h' with 's' in the sentence.
Example Output: tsis is a batsroom found in a sotel

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: 'the lights of vehicles are shining as they cross a river bridge'. Replace the letter 'r' with 'f' in the sentence.
Example Output:
the lights of vehicles afe shining as they cfoss a fivef bfidge