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: 'a group of elephants near a body of water'. Replace the letter 'a' with 'q' in the sentence.

SOLUTION: q group of elephqnts neqr q body of wqter

PROBLEM: Sentence: 'a dish of pasta topped with mushrooms sitting on a table'. Replace the letter 'w' with 'n' in the sentence.

SOLUTION:
a dish of pasta topped nith mushrooms sitting on a table