TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'this is a cute dog sticking his head out of the window of a red car'. Replace the letter 'e' with 'z' in the sentence.

SOLUTION: this is a cutz dog sticking his hzad out of thz window of a rzd car

PROBLEM: Sentence: 'a house cat sits on an oven door, sniffing the oven racks inside'. Replace the letter 'i' with 'y' in the sentence.

SOLUTION: a house cat syts on an oven door, snyffyng the oven racks ynsyde

PROBLEM: Sentence: 'a cup full of colored pencils next to a pencil sharpener'. Replace the letter 'd' with 'q' in the sentence.

SOLUTION:
a cup full of coloreq pencils next to a pencil sharpener