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

Example Input: Sentence: 'traffic congestion with cars and an electric tram'. Replace the letter 'a' with 'k' in the sentence.
Example Output: trkffic congestion with ckrs knd kn electric trkm

Example Input: Sentence: 'three men in a park playing a sport'. Replace the letter 'p' with 'w' in the sentence.
Example Output: three men in a wark wlaying a swort

Example Input: Sentence: 'a wood side board filled with different types of cakes'. Replace the letter 'e' with 'n' in the sentence.
Example Output:
a wood sidn board fillnd with diffnrnnt typns of cakns