def num_vowels(s):
    '''Return the number of vowels in string s.
    The letter "y" is not treated as a vowel.'''
			
    count = 0
    for char in s:
        if char in "aAeEiIoOuU":
            count = count + 1
				
    return count			


def askAndCountRepeat():
    ''' Prompt the user to enter a string and find out if it
        contains any vowels. Repeat this task until a string
        containing a vowel is found.  When you find a string
        containing a vowel, return the number of vowels in
        that string (an int)'''
    num = 0    
    while num == 0:
        myString = input("Enter a string: ")
        num = num_vowels(myString)
    return num

def main():
    num = askAndCountRepeat()
    print("Finally!  Found a string with vowels.")
    print("It has",num,"vowels")

main()