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 white nerd with a tie around his sweater'. Replace the letter 'i' with 'q' in the sentence.

SOLUTION: a whqte nerd wqth a tqe around hqs sweater

PROBLEM: Sentence: 'a very cute giraffe eating leaves from a high tree'. Replace the letter 'g' with 'b' in the sentence.

SOLUTION:
a very cute biraffe eatinb leaves from a hibh tree