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

Example Input: Sentence: 'a baseball player holding a bat in front of catcher and umpire'. Replace the letter 'i' with 'k' in the sentence.
Example Output: a baseball player holdkng a bat kn front of catcher and umpkre

Example Input: Sentence: 'a ping pong player is in a ready stance to return the ball'. Replace the letter 'n' with 'e' in the sentence.
Example Output: a pieg poeg player is ie a ready staece to reture the ball

Example Input: Sentence: 'this is a tennis player getting ready to serve the ball'. Replace the letter 'h' with 'y' in the sentence.
Example Output:
tyis is a tennis player getting ready to serve tye ball