TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a geoup of people on bicycles coming down a street'. Replace the letter 'i' with 'x' in the sentence.

SOLUTION: a geoup of people on bxcycles comxng down a street

PROBLEM: Sentence: 'three men in a park playing a sport'. Replace the letter 'p' with 'w' in the sentence.

SOLUTION: three men in a wark wlaying a swort

PROBLEM: Sentence: 'a burger is stacked with tomatoes, onion, lettuce and a pickle on the side'. Replace the letter 'u' with 'q' in the sentence.

SOLUTION:
a bqrger is stacked with tomatoes, onion, lettqce and a pickle on the side