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

Example Input: Sentence: 'the view from inside the water looking landward at the beach'. Replace the letter 'a' with 's' in the sentence.
Example Output: the view from inside the wster looking lsndwsrd st the besch

Example Input: Sentence: 'the door of the refrigerator has many magnets and small pictures on it'. Replace the letter 's' with 'z' in the sentence.
Example Output: the door of the refrigerator haz many magnetz and zmall picturez on it

Example Input: Sentence: 'people on a hill flying two large kites in the sky'. Replace the letter 'n' with 'l' in the sentence.
Example Output:
people ol a hill flyilg two large kites il the sky