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

Example Input: Sentence: 'a large white sign with black lettering  leaning against a metal fence'. Replace the letter 'e' with 'j' in the sentence.
Example Output: a largj whitj sign with black ljttjring  ljaning against a mjtal fjncj

Example Input: Sentence: 'a man rolling dough in the kitchen'. Replace the letter 'a' with 'e' in the sentence.
Example Output: e men rolling dough in the kitchen

Example Input: Sentence: 'a large black bear walking through a forest'. Replace the letter 'g' with 'e' in the sentence.
Example Output:
a laree black bear walkine throueh a forest