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

Sentence: 'a rose that is sitting in a vase'. Replace the letter 'r' with 'j' in the sentence.
a jose that is sitting in a vase

Sentence: 'a double decker bus stopped outside a station on a street'. Replace the letter 'c' with 'y' in the sentence.
a double deyker bus stopped outside a station on a street

Sentence: 'a city street filled with cars and a bus'. Replace the letter 'b' with 'n' in the sentence.

a city street filled with cars and a nus