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

Example Input: Sentence: 'a person flying a kite on the beach between some trees'. Replace the letter 's' with 'k' in the sentence.
Example Output: a perkon flying a kite on the beach between kome treek

Example Input: Sentence: 'a teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.
Example Output: a temmy bear playing a mrum anm a temmy bear playing a guitar

Example Input: Sentence: 'a room with a television set and a plaid chair'. Replace the letter 'a' with 'j' in the sentence.
Example Output:
j room with j television set jnd j pljid chjir