TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a white plate topped with two sandwich halves and a pile of potatoes chips'. Replace the letter 'o' with 'x' in the sentence.

SOLUTION: a white plate txpped with twx sandwich halves and a pile xf pxtatxes chips

PROBLEM: Sentence: 'a number of people sitting on chairs near each other'. Replace the letter 'c' with 'm' in the sentence.

SOLUTION: a number of people sitting on mhairs near eamh other

PROBLEM: Sentence: 'a cluttered, messy dorm with lots of electronics'. Replace the letter 'o' with 'y' in the sentence.

SOLUTION:
a cluttered, messy dyrm with lyts yf electrynics