TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'lose up of various trays of croissants and muffins'. Replace the letter 'n' with 'f' in the sentence.

SOLUTION: lose up of various trays of croissafts afd muffifs

PROBLEM: Sentence: 'a couple of giraffe standing next to each other near  a fence'. Replace the letter 'f' with 'j' in the sentence.

SOLUTION: a couple oj girajje standing next to each other near  a jence

PROBLEM: Sentence: 'a hand made stuffed bear is many colors'. Replace the letter 'm' with 'a' in the sentence.

SOLUTION:
a hand aade stuffed bear is aany colors