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: 'kites flying over a woman wearing a hat'. Replace the letter 'i' with 'j' in the sentence.

SOLUTION: kjtes flyjng over a woman wearjng a hat

PROBLEM: Sentence: 'a couple of cats rest on tops of different vehicles'. Replace the letter 'l' with 'm' in the sentence.

SOLUTION:
a coupme of cats rest on tops of different vehicmes