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

Example Input: Sentence: 'a dog drinking out of a bowl of water'. Replace the letter 'w' with 'k' in the sentence.
Example Output: a dog drinking out of a bokl of kater

Example Input: Sentence: 'a giraffe and a zebra stare at each other'. Replace the letter 'g' with 'l' in the sentence.
Example Output: a liraffe and a zebra stare at each other

Example Input: Sentence: 'the large sandwich is next to a bowl of sauce and fries'. Replace the letter 'f' with 'r' in the sentence.
Example Output:
the large sandwich is next to a bowl or sauce and rries