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

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

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

Sentence: 'a black stove in a small home kitchen'. Replace the letter 'l' with 'r' in the sentence.

a brack stove in a smarr home kitchen