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

Example Input: Sentence: 'two zebras are snuggling at the zoo in their display area'. Replace the letter 'e' with 'z' in the sentence.
Example Output: two zzbras arz snuggling at thz zoo in thzir display arza

Example Input: Sentence: 'a man has his hand on top of a blender'. Replace the letter 'd' with 'o' in the sentence.
Example Output: a man has his hano on top of a blenoer

Example Input: Sentence: 'someone is wearing a white shirt with a skinny black tie'. Replace the letter 'w' with 'x' in the sentence.
Example Output:
someone is xearing a xhite shirt xith a skinny black tie