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

Example Input: Sentence: 'a man sitting on a luggage cart inside of an airport'. Replace the letter 't' with 'a' in the sentence.
Example Output: a man siaaing on a luggage cara inside of an airpora

Example Input: Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.
Example Output: a long green grain traveling past a ohite building

Example Input: Sentence: 'a cut in half sandwich sitting on top of plate'. Replace the letter 'c' with 'n' in the sentence.
Example Output:
a nut in half sandwinh sitting on top of plate