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

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: 'a baby pokes his head out of a suitcase'. Replace the letter 'u' with 's' in the sentence.
Example Output: a baby pokes his head ost of a ssitcase

Example Input: Sentence: 'a woman sitting on top of a bed with a laptop computer'. Replace the letter 'o' with 'm' in the sentence.
Example Output:
a wmman sitting mn tmp mf a bed with a laptmp cmmputer