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

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: 'a teddy bear dressed in denim is laying on a floor'. Replace the letter 'i' with 'd' in the sentence.
Example Output: a teddy bear dressed dn dendm ds laydng on a floor

Example Input: Sentence: 'a group of kids watching other kids play a video game'. Replace the letter 'm' with 'e' in the sentence.
Example Output:
a group of kids watching other kids play a video gaee