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

Example Input: Sentence: 'a plate of food which contain smothered meat, potatoes and broccoli'. Replace the letter 'p' with 'v' in the sentence.
Example Output: a vlate of food which contain smothered meat, votatoes and broccoli

Example Input: Sentence: 'a man is on a saddled horse with reins'. Replace the letter 's' with 'o' in the sentence.
Example Output: a man io on a oaddled horoe with reino

Example Input: Sentence: 'a red fire extinguisher across a street from two silver sedans'. Replace the letter 'e' with 'w' in the sentence.
Example Output:
a rwd firw wxtinguishwr across a strwwt from two silvwr swdans