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+def reverse_vowels(s: str) -> str:
+ """
+ Reverse the vowels in a given string while preserving the case.
+
+ Args:
+ s (str): The input string.
+
+ Returns:
+ str: The string with vowels reversed.
+
+ Example:
+ >>> reverse_vowels("Raku")
+ 'Ruka'
+ """
+ vowels = "aeiouAEIOU"
+ # Extract vowels from the string in reverse order
+ reverse_vowel_list = [char for char in s if char in vowels][::-1]
+
+ # Replace vowels in the string with reversed vowels
+ result = []
+ reversed_vowels_iter = iter(reverse_vowel_list)
+ for char in s:
+ if char in vowels:
+ # Ensure the case of the vowel is preserved
+ next_vowel = next(reversed_vowels_iter, char)
+ result.append(
+ next_vowel.swapcase()
+ if char.isupper() != next_vowel.isupper()
+ else next_vowel
+ )
+ else:
+ result.append(char)
+ return "".join(result)
+
+
+# Tests
+assert reverse_vowels("Raku") == "Ruka"
+assert reverse_vowels("Perl") == "Perl"
+assert reverse_vowels("Julia") == "Jaliu"
+assert reverse_vowels("Uiua") == "Auiu"
+
+# Run the function with the test cases
+if __name__ == "__main__":
+ for test in ["Raku", "Perl", "Julia", "Uiua"]:
+ print(f"{test} -> {reverse_vowels(test)}")