TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a row of lawn chairs with umbrellas over them'. Replace the letter 'e' with 'x' in the sentence.

SOLUTION: a row of lawn chairs with umbrxllas ovxr thxm

PROBLEM: Sentence: 'a man eats food that is inside a banana peel'. Replace the letter 'n' with 'k' in the sentence.

SOLUTION: a mak eats food that is ikside a bakaka peel

PROBLEM: Sentence: 'a couple of surfers walking along the beach'. Replace the letter 's' with 'o' in the sentence.

SOLUTION:
a couple of ourfero walking along the beach