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: 'bus with sheep decals in foreign language and doughnuts'. Replace the letter 'g' with 'i' in the sentence.
Example Output: bus with sheep decals in foreiin laniuaie and douihnuts

Example Input: Sentence: 'a group of children are outside playing in the grass'. Replace the letter 'i' with 'b' in the sentence.
Example Output:
a group of chbldren are outsbde playbng bn the grass