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

Example Input: Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.
Example Output: a gdoup of small childden sitting at a table in fdont of a pizza

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: 'a baseball player hitting the ball in a game'. Replace the letter 'i' with 'h' in the sentence.
Example Output:
a baseball player hhtthng the ball hn a game