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

Example Input: Sentence: 'the door of the refrigerator has many magnets and small pictures on it'. Replace the letter 's' with 'z' in the sentence.
Example Output: the door of the refrigerator haz many magnetz and zmall picturez on it

Example Input: Sentence: 'two tennis players shaking hands across the net'. Replace the letter 't' with 's' in the sentence.
Example Output: swo sennis players shaking hands across she nes

Example Input: Sentence: 'man standing over a cat standing inside of his sink'. Replace the letter 'n' with 'e' in the sentence.
Example Output:
mae staedieg over a cat staedieg ieside of his siek