def isVowel(char):
    '''
    char: a single letter of any case
    vowels are:  ('a', 'e', 'i', 'o', or 'u'),
    returns: True if char is a vowel and False otherwise.
    '''
    return (char == 'a' or char =='A' or char == 'e' or char =='E' or char == 'i' or char =='I' or char == 'o' or char =='O' or char == 'u' or char =='U')
