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

Example Input: Sentence: 'a bathroom with a white toilet next to a large window'. Replace the letter 'w' with 'x' in the sentence.
Example Output: a bathroom xith a xhite toilet next to a large xindox

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 man in white shirt grinding on a skateboard'. Replace the letter 'n' with 'b' in the sentence.
Example Output:
a mab ib white shirt gribdibg ob a skateboard