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

Input: Consider Input: Sentence: 'an umbrella sitting on top of a hill next to a body of water'. Replace the letter 't' with 'b' in the sentence.

Output: an umbrella sibbing on bop of a hill nexb bo a body of waber


Input: Consider Input: Sentence: 'two men and a dog are standing beside a building'. Replace the letter 'b' with 'y' in the sentence.

Output: two men and a dog are standing yeside a yuilding


Input: Consider Input: Sentence: 'there is a pizza with fresh cheese on it'. Replace the letter 't' with 'b' in the sentence.


Output: bhere is a pizza wibh fresh cheese on ib