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

Example Input: Sentence: 'a young baseball player throws the ball as others watch'. Replace the letter 'a' with 'n' in the sentence.
Example Output: n young bnsebnll plnyer throws the bnll ns others wntch

Example Input: Sentence: 'a person on a snowboard does an air trick'. Replace the letter 'n' with 'o' in the sentence.
Example Output: a persoo oo a soowboard does ao air trick

Example Input: Sentence: 'a waterview with multiple boats in the water'. Replace the letter 'r' with 'w' in the sentence.
Example Output:
a watewview with multiple boats in the watew