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

Sentence: 'a person is riding a motorcycle as part of some kind of performance'. Replace the letter 'm' with 'a' in the sentence.
a person is riding a aotorcycle as part of soae kind of perforaance

Sentence: 'a batter is batting at a baseball game'. Replace the letter 'b' with 'e' in the sentence.
a eatter is eatting at a easeeall game

Sentence: 'gray cat lying in white sink in grassy area'. Replace the letter 'i' with 'u' in the sentence.

gray cat lyung un whute sunk un grassy area