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

Example Input: Sentence: 'a woman is talking on her white phone'. Replace the letter 'w' with 'r' in the sentence.
Example Output: a roman is talking on her rhite phone

Example Input: Sentence: 'a girl riding a horse is jumping the log'. Replace the letter 'a' with 't' in the sentence.
Example Output: t girl riding t horse is jumping the log

Example Input: Sentence: 'a metal tray holding various vegetables that include potatoes and onions'. Replace the letter 'h' with 'e' in the sentence.
Example Output:
a metal tray eolding various vegetables teat include potatoes and onions