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

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

Output: a person is riding a aotorcycle as part of soae kind of perforaance

Input: Consider Input: Sentence: 'a giraffe leaning over a fence from inside it's pasture'. Replace the letter 'n' with 'l' in the sentence.

Output: a giraffe lealilg over a felce from ilside it's pasture

Input: Consider Input: Sentence: 'a giraffe walking around by some trees in the background'. Replace the letter 'e' with 'r' in the sentence.
Output: a giraffr walking around by somr trrrs in thr background