def numberToText(n):
    digits = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
    teens = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
    adults = ["twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety"]
    text = ""
    if (n < 0 or n > 100): text = "invalid number"
    elif (n <= 9): text = digits[n % 10]
    elif (n <= 19): text = teens[n % 10]
    elif (n <= 99 and n % 10 == 0): text = adults[int(n / 10) - 2]
    elif (n <= 99 and n % 10 != 0): text = adults[int(n / 10) - 2] + ' ' + digits[n % 10]
    else: text = "one hundred"
    return text

n = int(input())
print(numberToText(n))