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: 'a house cat sits on an oven door, sniffing the oven racks inside'. Replace the letter 'i' with 'y' in the sentence.

SOLUTION: a house cat syts on an oven door, snyffyng the oven racks ynsyde

PROBLEM: Sentence: 'an evening picture of motorcycles and cars parked on the street with a purpose outside'. Replace the letter 'p' with 'z' in the sentence.

SOLUTION:
an evening zicture of motorcycles and cars zarked on the street with a zurzose outside