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

Example Input: Sentence: 'two police officers riding horses down the street'. Replace the letter 'o' with 'd' in the sentence.
Example Output: twd pdlice dfficers riding hdrses ddwn the street

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: 'a cat rubbing up against the camera persons legs'. Replace the letter 's' with 'o' in the sentence.
Example Output:
a cat rubbing up againot the camera peroono lego