instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
answer:
u mun who is surfing in u wuve in the oceun


question:
Sentence: 'a fire hydrant with a message painted on it'. Replace the letter 'n' with 'j' in the sentence.
answer:
a fire hydrajt with a message paijted oj it


question:
Sentence: 'a young girl in pajamas holding a pizza crust'. Replace the letter 'd' with 'f' in the sentence.
answer:

a young girl in pajamas holfing a pizza crust