TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man rolling dough in the kitchen'. Replace the letter 'a' with 'e' in the sentence.

SOLUTION: e men rolling dough in the kitchen

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: 'graffiti on a train compartment and a metal container placed nearby'. Replace the letter 'i' with 'f' in the sentence.

SOLUTION:
graffftf on a trafn compartment and a metal contafner placed nearby