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

Example Input: Sentence: 'a bathroom that has  a sink and a toilet'. Replace the letter 's' with 'a' in the sentence.
Example Output: a bathroom that haa  a aink and a toilet

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 father and son standing by a cake on a table'. Replace the letter 'n' with 'l' in the sentence.
Example Output:
a father ald sol staldilg by a cake ol a table