In this task, you need to replace a letter in the sentence with another given letter.
--------
Question: Sentence: 'a man is standing on a snowboard, atop a mountain'. Replace the letter 'd' with 'u' in the sentence.

Answer: a man is stanuing on a snowboaru, atop a mountain

Question: Sentence: 'a bunch of signs on a pole on the street'. Replace the letter 'c' with 's' in the sentence.

Answer: a bunsh of signs on a pole on the street

Question: Sentence: 'a man is looking at a large pizza at a table'. Replace the letter 'a' with 'j' in the sentence.

Answer:
j mjn is looking jt j ljrge pizzj jt j tjble