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 bunch of animals that are runing in a field'. Replace the letter 'm' with 'j' in the sentence.

SOLUTION: a bunch of anijals that are runing in a field

PROBLEM: Sentence: 'people with forks posing with a box of dessert'. Replace the letter 'b' with 'c' in the sentence.

SOLUTION:
people with forks posing with a cox of dessert