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

Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
u mun who is surfing in u wuve in the oceun

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 pianist in a suit and glasses playing a keyboard'. Replace the letter 't' with 'v' in the sentence.

a pianisv in a suiv and glasses playing a keyboard