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

Example Input: Sentence: 'a man is standing with this luggage next to a railroad track'. Replace the letter 'g' with 'l' in the sentence.
Example Output: a man is standinl with this lullale next to a railroad track

Example Input: Sentence: 'a shower, toilet and sink are highlights in this clean bathroom'. Replace the letter 'e' with 'd' in the sentence.
Example Output: a showdr, toildt and sink ard highlights in this cldan bathroom

Example Input: Sentence: 'a fire escape on the side of a building with a hotel neon sign'. Replace the letter 'b' with 'e' in the sentence.
Example Output:
a fire escape on the side of a euilding with a hotel neon sign