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: 'two cars parked next to each other in a parking lot'. Replace the letter 'i' with 'h' in the sentence.
Example Output: two cars parked next to each other hn a parkhng lot

Example Input: Sentence: 'a tea pot is steaming on the stove top'. Replace the letter 't' with 'y' in the sentence.
Example Output:
a yea poy is syeaming on yhe syove yop