In this task, you need to replace a letter in the sentence with another given letter.
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Question: Sentence: 'a red train sitting at an empty station'. Replace the letter 'i' with 'h' in the sentence.

Answer: a red trahn shtthng at an empty stathon

Question: Sentence: 'an airplane moves through the skies above a snowy mountain range'. Replace the letter 'l' with 's' in the sentence.

Answer: an airpsane moves through the skies above a snowy mountain range

Question: Sentence: 'a street post with a sign and trees in the background'. Replace the letter 'e' with 'g' in the sentence.

Answer:
a strggt post with a sign and trggs in thg background