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: 'a little girl laying on a boogie board next to the ocean'. Replace the letter 't' with 'm' in the sentence.
Example Output: a limmle girl laying on a boogie board nexm mo mhe ocean

Example Input: Sentence: 'a red stop sign sitting on top of a metal pole'. Replace the letter 'i' with 'w' in the sentence.
Example Output:
a red stop swgn swttwng on top of a metal pole