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

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: 'several older electronics, including cellular phones and a palm pilot with a  broken screen next to each other in white box enclosure'. Replace the letter 'u' with 't' in the sentence.
Example Output: several older electronics, incltding celltlar phones and a palm pilot with a  broken screen next to each other in white box enclostre

Example Input: Sentence: 'the kitten is sitting at the table with a person'. Replace the letter 't' with 'a' in the sentence.
Example Output:
ahe kiaaen is siaaing aa ahe aable wiah a person