listOnesPlace = 'one two three four five six seven eight nine'.split()
listTensPlace = 'twenty thirty forty fifty sixty seventy eighty ninety'.split()
listTeens = 'ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen'.split()
listMagnitudes = 'thousand million billion trillion quadrillion quintillion sextillion septillion octillion nonillion decillion undecillion duodecillion trececillion quattuordecillion quindecillion'.split()

def takeBiggestChunk(strNum):
    mag = 0
    strBig = strNum
    while len(strBig) > 3:
        strBig = strBig[:len(strBig)-3]
        mag += 1
    strSmall = strNum[len(strNum)-3*mag:]
    return strBig, strSmall, mag

def printNumber(strNum):
    strWords = []
    strSmall = strNum

    while True:
        strBig, strSmall, mag = takeBiggestChunk(strSmall)
        if mag == 0:
            break
        strWords += hundreds(strBig)
        strWords += ' '
        strWords += listMagnitudes[mag-1]
        strWords += ', '

    strWords += hundreds(strBig)

    return ''.join(strWords)

def hundreds(strNum):
    strWords = []
    if len(strNum) == 3 and strNum[0] != '0':
        strWords += listOnesPlace[int(strNum[0])-1]
        strWords += ' hundred '
    strWords += tensAndOnes(strNum[len(strNum)-2:len(strNum)])
    return ''.join(strWords)

def tensAndOnes(strNum):
    strWords = []
    if len(strNum) == 1 or strNum[0] == '0':
        strWords += listOnesPlace[int(strNum[0])-1]
    else:
        if strNum[0] == '0':
            strWords += listOnesPlace[int(strNum[1])-1]
        elif strNum[0] == '1':
            strWords += listTeens[int(strNum[1])]
        else:
            strWords += listTensPlace[int(strNum[0])-2]
            if strNum[1] != '0':
                strWords += '-'
                strWords += listOnesPlace[int(strNum[1])-1]
    return ''.join(strWords)

def askForNumber():
    print('Hello! Please enter a number.')
    while True:
        number = input()
        if number.isdigit():
            return number
        else:
            print('Please enter any number from 1 to 99, in numerical form.')

def promptRestart():
    print('Restart? (y/n)')
    return input().lower().startswith('y')

while True:
    print (printNumber(askForNumber()))
    if not promptRestart():
        break