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: 'two tennis players shaking hands over the net'. Replace the letter 'n' with 'f' in the sentence.
Example Output: two teffis players shakifg hafds over the fet

Example Input: Sentence: 'a couple is talking in the kitchen with a phone'. Replace the letter 'n' with 's' in the sentence.
Example Output:
a couple is talkisg is the kitches with a phose