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

Example Input: Sentence: 'a white plate topped with two sandwich halves and a pile of potatoes chips'. Replace the letter 'o' with 'x' in the sentence.
Example Output: a white plate txpped with twx sandwich halves and a pile xf pxtatxes chips

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: 'the kitchen has a big screen tv and a lot of counter space'. Replace the letter 'h' with 'z' in the sentence.
Example Output:
tze kitczen zas a big screen tv and a lot of counter space