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

Q: Sentence: 'a book shelf full of books and nick nacks '. Replace the letter 'o' with 'm' in the sentence.

A: a bmmk shelf full mf bmmks and nick nacks 
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Q: Sentence: 'a man riding a snowboard on the side of a wall'. Replace the letter 'm' with 'p' in the sentence.

A: a pan riding a snowboard on the side of a wall
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Q: Sentence: 'a small car is sandwiched between two large buses'. Replace the letter 'a' with 'm' in the sentence.

A:
m smmll cmr is smndwiched between two lmrge buses
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