TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'traffic congestion with cars and an electric tram'. Replace the letter 'a' with 'k' in the sentence.

SOLUTION: trkffic congestion with ckrs knd kn electric trkm

PROBLEM: Sentence: 'two parrots on a tree next to a metal pan'. Replace the letter 'w' with 'j' in the sentence.

SOLUTION: tjo parrots on a tree next to a metal pan

PROBLEM: Sentence: 'an engine sits on one track while another train sits on another'. Replace the letter 'n' with 'm' in the sentence.

SOLUTION:
am emgime sits om ome track while amother traim sits om amother