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

Example Input: Sentence: 'a white plate topped with a cut in half sandwich'. Replace the letter 'o' with 'x' in the sentence.
Example Output: a white plate txpped with a cut in half sandwich

Example Input: Sentence: 'a pink table topped with plates and bowls of food'. Replace the letter 'p' with 'x' in the sentence.
Example Output: a xink table toxxed with xlates and bowls of food

Example Input: Sentence: 'a box of a dozen doughnuts all varieties'. Replace the letter 'l' with 'i' in the sentence.
Example Output:
a box of a dozen doughnuts aii varieties