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

Example Input: Sentence: 'a table that has a pizza sitting on it'. Replace the letter 'a' with 'w' in the sentence.
Example Output: w twble thwt hws w pizzw sitting on it

Example Input: Sentence: 'an elephant in chains converses with a smaller elephant who is not wearing chains'. Replace the letter 'i' with 'm' in the sentence.
Example Output: an elephant mn chamns converses wmth a smaller elephant who ms not wearmng chamns

Example Input: Sentence: 'people waiting in line at a food truck'. Replace the letter 'i' with 'k' in the sentence.
Example Output:
people waktkng kn lkne at a food truck