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

Example Input: Sentence: 'wooden park bench sitting between two trees with grassy background'. Replace the letter 'i' with 'q' in the sentence.
Example Output: wooden park bench sqttqng between two trees wqth grassy background

Example Input: Sentence: 'a man stands next to a basketball as it sits on the floor'. Replace the letter 'n' with 'o' in the sentence.
Example Output: a mao staods oext to a basketball as it sits oo the floor

Example Input: Sentence: 'the plane is gray and is sitting on the tarmac'. Replace the letter 'm' with 'q' in the sentence.
Example Output:
the plane is gray and is sitting on the tarqac