TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a box of a dozen doughnuts all varieties'. Replace the letter 'l' with 'i' in the sentence.

SOLUTION: a box of a dozen doughnuts aii varieties

PROBLEM: Sentence: 'this refrigerator is covered in stickers on it'. Replace the letter 't' with 'h' in the sentence.

SOLUTION: hhis refrigerahor is covered in shickers on ih

PROBLEM: Sentence: 'a baseball player standing next to home plate with a bat'. Replace the letter 't' with 'c' in the sentence.

SOLUTION:
a baseball player scanding nexc co home place wich a bac