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

Example Input: Sentence: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.
Example Output: subwac train approaching the platform of a subwac station

Example Input: Sentence: 'television and vcr console flanked by tan leather recliner and white plastic cube side table'. Replace the letter 'c' with 'j' in the sentence.
Example Output: television and vjr jonsole flanked by tan leather rejliner and white plastij jube side table

Example Input: Sentence: 'a man works on a surf board'. Replace the letter 'o' with 'r' in the sentence.
Example Output:
a man wrrks rn a surf brard