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: 'woman pushing a cart of luggage in a transportation terminal'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION: womwn pushing w cwrt of luggwge in w trwnsportwtion terminwl

PROBLEM: Sentence: 'one dog outside one dog inside looking out'. Replace the letter 'o' with 'i' in the sentence.

SOLUTION:
ine dig iutside ine dig inside liiking iut