TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a cat is watching a computer with a video of a cat'. Replace the letter 't' with 'a' in the sentence.

SOLUTION: a caa is waaching a compuaer wiah a video of a caa

PROBLEM: Sentence: 'a kitchen with a fridge, stove, window, and dining table'. Replace the letter 'd' with 'f' in the sentence.

SOLUTION: a kitchen with a frifge, stove, winfow, anf fining table

PROBLEM: Sentence: 'a horse pulling a carriage on a city street'. Replace the letter 'y' with 'v' in the sentence.

SOLUTION:
a horse pulling a carriage on a citv street