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

Example Input: Sentence: 'mannequins are beside a motor scooter inside a display case'. Replace the letter 'l' with 'c' in the sentence.
Example Output: mannequins are beside a motor scooter inside a dispcay case

Example Input: Sentence: 'a pile of chopped up broccoli sits next to bottles of sauces'. Replace the letter 't' with 'y' in the sentence.
Example Output: a pile of chopped up broccoli siys nexy yo boyyles of sauces

Example Input: Sentence: 'a boy wearing a green shirt doing a trick on a skateboard'. Replace the letter 'a' with 'f' in the sentence.
Example Output:
f boy wefring f green shirt doing f trick on f skftebofrd