
def search4vowels(phrase: str)->set:
    """Return any vowels found in a supplied phrase."""
    vowels = {'a', 'e', 'i', 'o', 'u'}
    return vowels.intersection(set(phrase))


def search4letters(phrase: str, letters: str)->set:
    """Return a set of the 'letter' found in 'phrase'."""
    return set(phrase).intersection(set(letters))