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

Example Input: Sentence: 'a pair of planes in an airport lot parked for boarding and exiting'. Replace the letter 'e' with 'o' in the sentence.
Example Output: a pair of planos in an airport lot parkod for boarding and oxiting

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: 'four photos of men dancing in a courtyard'. Replace the letter 'o' with 'e' in the sentence.
Example Output:
feur phetes ef men dancing in a ceurtyard