TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a brown door  that says gentlemen and a toilet'. Replace the letter 'o' with 'f' in the sentence.

SOLUTION: a brfwn dffr  that says gentlemen and a tfilet

PROBLEM: Sentence: 'broccoli and a sweet potato are served on a white plate'. Replace the letter 'o' with 'c' in the sentence.

SOLUTION: brccccli and a sweet pctatc are served cn a white plate

PROBLEM: Sentence: 'an airplane prepares to land at the airport'. Replace the letter 'p' with 'j' in the sentence.

SOLUTION:
an airjlane jrejares to land at the airjort