In this task, you need to replace a letter in the sentence with another given letter.
--------
Question: Sentence: 'a crowd stands under a set of lights in the ceiling and one person holds up a cell phone'. Replace the letter 'r' with 'f' in the sentence.

Answer: a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone

Question: Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.

Answer: a long green grain traveling past a ohite building

Question: Sentence: 'stuffed bears hang in rows in a display'. Replace the letter 's' with 'e' in the sentence.

Answer:
etuffed beare hang in rowe in a dieplay