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

Example Input: Sentence: 'the child is throwing the frisbee through the hoop'. Replace the letter 't' with 'm' in the sentence.
Example Output: mhe child is mhrowing mhe frisbee mhrough mhe hoop

Example Input: Sentence: 'a man in blazer holding a tie over his eyes'. Replace the letter 's' with 'e' in the sentence.
Example Output: a man in blazer holding a tie over hie eyee

Example Input: Sentence: 'a man is playing tennis on a clay court'. Replace the letter 'a' with 's' in the sentence.
Example Output:
s msn is plsying tennis on s clsy court