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

Example Input: Sentence: 'a living room with an orange couch and green decorations'. Replace the letter 'c' with 'm' in the sentence.
Example Output: a living room with an orange moumh and green demorations

Example Input: Sentence: 'a single person is working in the cluttered kitchen'. Replace the letter 'n' with 'e' in the sentence.
Example Output: a siegle persoe is workieg ie the cluttered kitchee

Example Input: Sentence: 'a man jumping on a hotel bed with many pillows'. Replace the letter 'y' with 'd' in the sentence.
Example Output:
a man jumping on a hotel bed with mand pillows