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

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: 'little tubs of rice and mixed vegetables for a meal'. Replace the letter 't' with 'z' in the sentence.
Example Output: lizzle zubs of rice and mixed vegezables for a meal

Example Input: Sentence: 'a man sitting at a table with jars of peanut butter, bread, honey, lemons and plates'. Replace the letter 's' with 'y' in the sentence.
Example Output:
a man yitting at a table with jary of peanut butter, bread, honey, lemony and platey