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

Q: 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.

A: a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone
****
Q: Sentence: 'a yellow fire hydrant sitting on the sidewalk'. Replace the letter 'o' with 'd' in the sentence.

A: a yelldw fire hydrant sitting dn the sidewalk
****
Q: Sentence: 'a messy room with clothes and a computer'. Replace the letter 'o' with 'w' in the sentence.

A:
a messy rwwm with clwthes and a cwmputer
****