In this task, you need to replace a letter in the sentence with another given letter.

Input: Consider Input: Sentence: 'a cat is watching a computer with a video of a cat'. Replace the letter 't' with 'a' in the sentence.

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

Input: Consider Input: Sentence: 'a gray and white cat sleeping on top of a laptop computer'. Replace the letter 'l' with 'g' in the sentence.

Output: a gray and white cat sgeeping on top of a gaptop computer

Input: Consider Input: Sentence: 'a man and a woman formally dressed posing for a picture'. Replace the letter 'l' with 'c' in the sentence.
Output: a man and a woman formaccy dressed posing for a picture