In this task, you need to replace a letter in the sentence with another given letter.
--------
Question: Sentence: 'a large clock tower next to a building on a street'. Replace the letter 'c' with 'n' in the sentence.

Answer: a large nlonk tower next to a building on a street


Question: 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.

Answer: several older electronics, incltding celltlar phones and a palm pilot with a  broken screen next to each other in white box enclostre


Question: Sentence: 'a group of people standing next to a subway train'. Replace the letter 'r' with 's' in the sentence.

Answer:
a gsoup of people standing next to a subway tsain