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

[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: 'an airplane moves through the skies above a snowy mountain range'. Replace the letter 'l' with 's' in the sentence.
[EX A]: an airpsane moves through the skies above a snowy mountain range

[EX Q]: Sentence: 'two airplanes are bluing over the blue ocean'. Replace the letter 'r' with 's' in the sentence.
[EX A]:
two aisplanes ase bluing oves the blue ocean