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#Prompting user to enter a letter
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letter=input("Please enter a letter to check if it is a vowel: ")
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#determining if a letter is a vowel or not.
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if letter == "a"or"e"or"i"or"o"or"o"or"u"or"A"or"E"or"I"or"O"or"U":
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print("OK")
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else:
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print("This letter is not a vowel")
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