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

Example Input: Sentence: 'a patio filled with white tables and chairs covered with umbrellas'. Replace the letter 'o' with 'e' in the sentence.
Example Output: a patie filled with white tables and chairs cevered with umbrellas

Example Input: Sentence: 'a police officer on a horse is riding down the street'. Replace the letter 'h' with 'a' in the sentence.
Example Output: a police officer on a aorse is riding down tae street

Example Input: Sentence: 'a woman on a home computer at a desk'. Replace the letter 'k' with 'z' in the sentence.
Example Output:
a woman on a home computer at a desz