def secondLargest(L):

    return secondLargestHelper(L, None, None)

 

def secondLargestHelper(L, largest, secondLargest):

    if L == []:

        return secondLargest

    first = L[0]

    rest = L[1:]

    if largest == None or first > largest:

        secondLargest = largest

        largest = first

    elif secondLargest == None or (first > secondLargest):

        secondLargest = first

    return secondLargestHelper(rest, largest, secondLargest)

 

def vowelRun(s):

    if s == '' or s[0] not in "aeiouAEIOU":

        return 0

    else:

        return 1 + vowelRun(s[1:])

 

def longestVowelRun(s):

    if s == '':

        return 0

    vowelLength = vowelRun(s)

    bestRun = longestVowelRun(s[1:])

    if vowelLength > bestRun:

        return vowelLength

    return bestRun

 

def testSecondLargest():

    print('Testing secondLargest()...', end= '')

    assert(secondLargest([2, 5, 3, 4, 1]) == 4)

    assert(secondLargest([6, 5, 6, 6, 6]) == 6)

    assert(secondLargest([1]) == None)

    assert(secondLargest([]) == None)

    assert(secondLargest([2, 24, 120, 39]) == 39)

    print("Passed!")

 

def testLongestVowelRun():

    print('Testing longestVowelRun()...', end= '')

    assert(longestVowelRun('AbcAeiD aEoa ba') == 4)

    assert(longestVowelRun('cnsnts') == 0)

    assert(longestVowelRun('aeiouAEIOU') == 10)

    assert(longestVowelRun('') == 0)

    print("Passed!")

 

testSecondLargest()

testLongestVowelRun()