num2words1 = {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five', \
            6: 'six', 7: 'seven', 8: 'eight', 9: 'nine', 10: 'ten', \
            11: 'eleven', 12: 'twelve', 13: 'thirteen', 14: 'fourteen', \
            15: 'fifteen', 16: 'sixteen', 17: 'seventeen', 18: 'eighteen', 19: 'nineteen'}
num2words2 = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety']


def number(Number):
    if Number == 0:
        return f'zero'
    elif 1 <= Number < 19:
        return num2words1[Number]
    elif 20 <= Number <= 99:
        if Number % 10 == 0:
            tens = int(Number / 10)
            return num2words2[tens - 2]
        else:
            tens, below_ten = divmod(Number, 10)
            return num2words2[tens - 2] + ' ' + num2words1[below_ten]
    elif Number == 100:
        return f'one hundred'
    else:
        print("Number out of range")


def main():
    num = eval(input())
    print(number(num))


main()