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

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: 'a man stands next to a basketball as it sits on the floor'. Replace the letter 'n' with 'o' in the sentence.
Example Output: a mao staods oext to a basketball as it sits oo the floor

Example Input: Sentence: 'a living room with a couch and a table'. Replace the letter 't' with 'a' in the sentence.
Example Output:
a living room wiah a couch and a aable