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

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

A: u mun who is surfing in u wuve in the oceun
****
Q: Sentence: 'an old rusty car sits outside of an old building'. Replace the letter 'o' with 'r' in the sentence.

A: an rld rusty car sits rutside rf an rld building
****
Q: Sentence: 'a few bikes and a motorcycle are parked outside'. Replace the letter 'a' with 'm' in the sentence.

A:
m few bikes mnd m motorcycle mre pmrked outside
****