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

Example Input: Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.
Example Output: a zibra is iating hay in a fincid inclosuri

Example Input: Sentence: 'lots of luggage is jammed into the back compartment of a van'. Replace the letter 'o' with 'h' in the sentence.
Example Output: lhts hf luggage is jammed inth the back chmpartment hf a van

Example Input: Sentence: 'a man holding a drawn bow aiming at a woman holding an apple'. Replace the letter 'a' with 'q' in the sentence.
Example Output:
q mqn holding q drqwn bow qiming qt q womqn holding qn qpple