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

Example Input: Sentence: 'people are standing outside in the parking lot'. Replace the letter 'i' with 'z' in the sentence.
Example Output: people are standzng outszde zn the parkzng lot

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: 'a hand that is holding onto a tie'. Replace the letter 'n' with 'j' in the sentence.
Example Output:
a hajd that is holdijg ojto a tie