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

Q: Sentence: 'a crooked street sign on a damaged sidewalk'. Replace the letter 'm' with 'u' in the sentence.

A: a crooked street sign on a dauaged sidewalk
****
Q: Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.

A: a buixding has a cxock on the top of it
****
Q: Sentence: 'a person sits on the sidewalk bench near a flock of birds'. Replace the letter 'i' with 'b' in the sentence.

A:
a person sbts on the sbdewalk bench near a flock of bbrds
****