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 man is posing in a desert, leaning on a sign with an image of a camel on it'. Replace the letter 'i' with 'r' in the sentence.
Example Output: a man rs posrng rn a desert, leanrng on a srgn wrth an rmage of a camel on rt

Example Input: Sentence: 'this is a cute dog sticking his head out of the window of a red car'. Replace the letter 'e' with 'z' in the sentence.
Example Output:
this is a cutz dog sticking his hzad out of thz window of a rzd car