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

Example Input: Sentence: 'a bunch of red apples next to a few oranges'. Replace the letter 'n' with 'x' in the sentence.
Example Output: a buxch of red apples xext to a few oraxges

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 man touching bread sitting on top of a counter'. Replace the letter 'a' with 'o' in the sentence.
Example Output:
o mon touching breod sitting on top of o counter