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

Input: Consider Input: Sentence: 'a small bird perched on some thin branches'. Replace the letter 'a' with 'f' in the sentence.

Output: f smfll bird perched on some thin brfnches


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: 'a bunch of motorcycles that are lined up together'. Replace the letter 'a' with 't' in the sentence.


Output: t bunch of motorcycles thtt tre lined up together