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 cat sits on the floor next to a purse'. Replace the letter 'a' with 'b' in the sentence.
[A]: b cbt sits on the floor next to b purse


[Q]: Sentence: 'a father teaching his son how to ride a skateboard up a ramp'. Replace the letter 'r' with 'm' in the sentence.
[A]:
a fathem teaching his son how to mide a skateboamd up a mamp