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

Example Input: Sentence: 'a spacious bedroom with tidy bed and sofa with cushions'. Replace the letter 'n' with 'c' in the sentence.
Example Output: a spacious bedroom with tidy bed acd sofa with cushiocs

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: 'there are buses and other vehicles moving down a crowded street'. Replace the letter 'o' with 'q' in the sentence.
Example Output:
there are buses and qther vehicles mqving dqwn a crqwded street