def reverse(string):
    if len(string)<=1:
        return string
    return string[-1]+reverse(string[:-1])

def vowelCount(string):
    if string=="":
        return 0
    elif (isVowel(string[0]) == True):
          return 1+vowelCount(string[1:])
    else:
          return vowelCount(string[1:])

def isVowel(letter):
    return letter in "AEIOUaeiou"