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

Example Input: Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
Example Output: u mun who is surfing in u wuve in the oceun

Example Input: Sentence: 'one wall in the room is flanked by a lovely piece of furniture which displays several object d'art'. Replace the letter 'n' with 'z' in the sentence.
Example Output: oze wall iz the room is flazked by a lovely piece of furziture which displays several object d'art

Example Input: Sentence: 'construction worker near digging equipment and unearthed fire hydrant'. Replace the letter 'n' with 'r' in the sentence.
Example Output:
corstructior worker rear diggirg equipmert ard urearthed fire hydrart