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

[EX Q]: Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.
[EX A]: a buixding has a cxock on the top of it

[EX Q]: Sentence: 'a couple of white street signs sitting on top of a pole'. Replace the letter 'n' with 't' in the sentence.
[EX A]: a couple of white street sigts sittitg ot top of a pole

[EX Q]: Sentence: 'a man standing by a garage door with his luggage in hand'. Replace the letter 'a' with 'b' in the sentence.
[EX A]:
b mbn stbnding by b gbrbge door with his luggbge in hbnd