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

Example Input: Sentence: 'a white bathroom with a stand alone sink and a shower curtain'. Replace the letter 'a' with 'm' in the sentence.
Example Output: m white bmthroom with m stmnd mlone sink mnd m shower curtmin

Example Input: Sentence: 'a painting of scissors going to cut a chain with a lock'. Replace the letter 'g' with 'v' in the sentence.
Example Output: a paintinv of scissors voinv to cut a chain with a lock

Example Input: Sentence: 'a group of people walking along a dirty snow covered road'. Replace the letter 'n' with 'i' in the sentence.
Example Output:
a group of people walkiig aloig a dirty siow covered road