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

Input: Consider Input: Sentence: 'a man is somewhat hard to be seen in the wave, on his board'. Replace the letter 's' with 'b' in the sentence.

Output: a man ib bomewhat hard to be been in the wave, on hib board

Input: Consider Input: Sentence: 'a man sitting on a luggage cart inside of an airport'. Replace the letter 't' with 'a' in the sentence.

Output: a man siaaing on a luggage cara inside of an airpora

Input: Consider Input: Sentence: 'a black bird is sitting on a thing wire'. Replace the letter 'h' with 'k' in the sentence.
Output: a black bird is sitting on a tking wire