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Reverse Vowels in String

Write a Python function `reverse_vowels(s: str) -> str` that takes a string `s` as input and returns a new string where only the vowels in `s` are reversed, while the positions of all other characters remain unchanged. Vowels are defined as `a, e, i, o, u` (both uppercase and lowercase). The letter `y` is not considered a vowel.

#### Example Usage
```python [main.nopy]
reverse_vowels("hello")  # Output: "holle"
reverse_vowels("Python")  # Output: "Python"
reverse_vowels("USA")  # Output: "ASU"
```

#### Constraints
- The input string `s` will only contain printable ASCII characters.
- The function should be case-sensitive (i.e., `A` and `a` are treated as vowels, but `A` is not equal to `a`).
def reverse_vowels(s: str) -> str:
    """
    Reverse only the vowels in the input string.

    Args:
        s (str): The input string.

    Returns:
        str: The string with vowels reversed.
    """
    # Define vowels
    vowels = "aeiouAEIOU"
    # Placeholder for solution
    pass
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