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

Example Input: Sentence: 'you are never to old to play with the nintendo wii'. Replace the letter 'e' with 'v' in the sentence.
Example Output: you arv nvvvr to old to play with thv nintvndo wii

Example Input: Sentence: 'woman pushing a cart of luggage in a transportation terminal'. Replace the letter 'a' with 'w' in the sentence.
Example Output: womwn pushing w cwrt of luggwge in w trwnsportwtion terminwl

Example Input: Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.
Example Output:
a couplp of ppoplp that arp pptting a horsp