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

Example Input: Sentence: 'a formal dinning room in a stately manor'. Replace the letter 'n' with 'o' in the sentence.
Example Output: a formal diooiog room io a stately maoor

Example Input: Sentence: 'two cars parked next to each other in a parking lot'. Replace the letter 'i' with 'h' in the sentence.
Example Output: two cars parked next to each other hn a parkhng lot

Example Input: Sentence: 'a cluster of boats and yachts gathered beneath a vibrant sunset sky'. Replace the letter 't' with 'r' in the sentence.
Example Output:
a clusrer of boars and yachrs garhered benearh a vibranr sunser sky