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

Example Input: Sentence: 'a person holding on to a black remote'. Replace the letter 'n' with 'h' in the sentence.
Example Output: a persoh holdihg oh to a black remote

Example Input: Sentence: 'some brown black and white horses clouds and rocks'. Replace the letter 'a' with 'n' in the sentence.
Example Output: some brown blnck nnd white horses clouds nnd rocks

Example Input: Sentence: 'a person making a pizza on top of a piece of paper'. Replace the letter 'f' with 'r' in the sentence.
Example Output:
a person making a pizza on top or a piece or paper