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

Input: Consider Input: Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.

Output: a zibra is iating hay in a fincid inclosuri


Input: Consider Input: Sentence: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.

Output: some trhcks for h rhil why system nehr h building


Input: Consider Input: Sentence: 'a bus driving down a street with cars behind it'. Replace the letter 'i' with 'n' in the sentence.


Output: a bus drnvnng down a street wnth cars behnnd nt