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

Example Input: Sentence: 'a person under an open umbrella in the sand'. Replace the letter 'd' with 'h' in the sentence.
Example Output: a person unher an open umbrella in the sanh

Example Input: Sentence: 'a man loads bananas high on top of a banana truck'. Replace the letter 'f' with 'c' in the sentence.
Example Output: a man loads bananas high on top oc a banana truck

Example Input: Sentence: 'the tennis player is about to hit the ball'. Replace the letter 'y' with 'r' in the sentence.
Example Output:
the tennis plarer is about to hit the ball