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

Example Input: Sentence: 'a bathroom that has a sink and a toilet'. Replace the letter 's' with 'a' in the sentence.
Example Output: a bathroom that haa a aink and a toilet

Example Input: Sentence: 'a couch, footrest, tv and other furniture are arranged in a living room'. Replace the letter 'o' with 'g' in the sentence.
Example Output: a cguch, fggtrest, tv and gther furniture are arranged in a living rggm

Example Input: Sentence: 'a woman sitting next to a little girl in front of giraffe'. Replace the letter 'e' with 'y' in the sentence.
Example Output:
a woman sitting nyxt to a littly girl in front of giraffy