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

Example Input: Sentence: 'the airplane is parked on the runway for people to look at'. Replace the letter 'a' with 'e' in the sentence.
Example Output: the eirplene is perked on the runwey for people to look et

Example Input: Sentence: 'a chinese entree displayed on a red plate'. Replace the letter 'n' with 'z' in the sentence.
Example Output: a chizese eztree displayed oz a red plate

Example Input: Sentence: 'luggage with airport luggage tags on the handles'. Replace the letter 'i' with 'y' in the sentence.
Example Output:
luggage wyth ayrport luggage tags on the handles