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

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 living room with a wooden table next to a kitchen'. Replace the letter 'e' with 'c' in the sentence.
Example Output: a living room with a woodcn tablc ncxt to a kitchcn

Example Input: Sentence: 'a group of men sitting at a table together'. Replace the letter 'e' with 'k' in the sentence.
Example Output:
a group of mkn sitting at a tablk togkthkr