TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'busy city street with pedestrians and cars with lights all around'. Replace the letter 'r' with 'k' in the sentence.

SOLUTION: busy city stkeet with pedestkians and caks with lights all akound

PROBLEM: Sentence: 'a city street with cars and busses near buildings'. Replace the letter 'e' with 'd' in the sentence.

SOLUTION: a city strddt with cars and bussds ndar buildings

PROBLEM: Sentence: 'a bunch of people on a beach flying parasols'. Replace the letter 'l' with 'j' in the sentence.

SOLUTION:
a bunch of peopje on a beach fjying parasojs