TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.

SOLUTION: b dog lbying in front of b horses stbll with the horse peeking over the hblf door

PROBLEM: Sentence: 'a table that has a pizza sitting on it'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION: w twble thwt hws w pizzw sitting on it

PROBLEM: Sentence: 'a pan with pizza and its cutter on it sit on  a stove top'. Replace the letter 'o' with 'e' in the sentence.

SOLUTION:
a pan with pizza and its cutter en it sit en  a steve tep