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

Example Input: Sentence: 'a fire hydrant and a rolled up fire hose'. Replace the letter 'd' with 's' in the sentence.
Example Output: a fire hysrant ans a rolles up fire hose

Example Input: Sentence: 'a couple of giraffe standing next to each other in a forest'. Replace the letter 'a' with 'w' in the sentence.
Example Output: w couple of girwffe stwnding next to ewch other in w forest

Example Input: Sentence: 'a family sitting down for a meal and conversation'. Replace the letter 's' with 'j' in the sentence.
Example Output:
a family jitting down for a meal and converjation