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

Example Input: Sentence: 'busy city street with pedestrians and cars with lights all around'. Replace the letter 'r' with 'k' in the sentence.
Example Output: busy city stkeet with pedestkians and caks with lights all akound

Example Input: Sentence: 'a man standing in the water flying a kite'. Replace the letter 'w' with 's' in the sentence.
Example Output: a man standing in the sater flying a kite

Example Input: Sentence: 'a beautiful woman standing next to a man'. Replace the letter 't' with 'k' in the sentence.
Example Output:
a beaukiful woman skanding nexk ko a man