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

Example Input: Sentence: 'a baseball player swings his bat at a pitch'. Replace the letter 's' with 'l' in the sentence.
Example Output: a baleball player lwingl hil bat at a pitch

Example Input: Sentence: 'three laptops are turned on lined up on a table'. Replace the letter 't' with 'g' in the sentence.
Example Output: ghree lapgops are gurned on lined up on a gable

Example Input: Sentence: 'two horses pull a carriage with three men dressed in red on it'. Replace the letter 'i' with 'y' in the sentence.
Example Output:
two horses pull a carryage wyth three men dressed yn red on yt