SpellOutInt0to999InEN

def SpellOutInt0to999InEN(input):
    and_ = False
    en = ""
    ones = ""
    tens = ""
    hundreds = ""

    if input // 100 == 0:
        hundreds = ""
    elif input // 100 == 1:
        hundreds = "one hundred"
    elif input // 100 == 2:
        hundreds = "two hundred"
    elif input // 100 == 3:
        hundreds = "three hundred"
    elif input // 100 == 4:
        hundreds = "four hundred"
    elif input // 100 == 5:
        hundreds = "five hundred"
    elif input // 100 == 6:
        hundreds = "six hundred"
    elif input // 100 == 7:
        hundreds = "seven hundred"
    elif input // 100 == 8:
        hundreds = "eight hundred"
    elif input // 100 == 9:
        hundreds = "nine hundred"

    if (input % 100) // 10 == 0:
        tens = ""
    elif (input % 100) // 10 == 1:
        tens = "ten"
    elif (input % 100) // 10 == 2:
        tens = "twenty"
    elif (input % 100) // 10 == 3:
        tens = "thirty"
    elif (input % 100) // 10 == 4:
        tens = "forty"
    elif (input % 100) // 10 == 5:
        tens = "fifty"
    elif (input % 100) // 10 == 6:
        tens = "sixty"
    elif (input % 100) // 10 == 7:
        tens = "seventy"
    elif (input % 100) // 10 == 8:
        tens = "eighty"
    elif (input % 100) // 10 == 9:
        tens = "ninety"

    if input % 10 == 0:
        ones = ""
    elif input % 10 == 1:
        ones = "one"
    elif input % 10 == 2:
        ones = "two"
    elif input % 10 == 3:
        ones = "three"
    elif input % 10 == 4:
        ones = "four"
    elif input % 10 == 5:
        ones = "five"
    elif input % 10 == 6:
        ones = "six"
    elif input % 10 == 7:
        ones = "seven"
    elif input % 10 == 8:
        ones = "eight"
    elif input % 10 == 9:
        ones = "nine"

    if tens == "" and ones == "":
        en = "zero" if hundreds == "" else hundreds

    elif tens == "ten":

        if ones == "":
            en = "ten"
        elif ones == "one":
            en = "eleven"
        elif ones == "two":
            en = "twelve"
        elif ones == "three":
            en = "thirteen"
        elif ones == "four":
            en = "fourteen"
        elif ones == "five":
            en = "fifteen"
        elif ones == "six":
            en = "sixteen"
        elif ones == "seven":
            en = "seventeen"
        elif ones == "eight":
            en = "eighteen"
        elif ones == "nine":
            en = "nineteen"

        if hundreds != "":
            en = hundreds + (" and " if and_ else " ") + en

    else:
        en = ones
        if tens != "":
            en = tens + ("" if ones == "" else " " + en)
        if hundreds != "":
            en = hundreds + (" and " if and_ else " ") + en

    return en


n = int(input())
print(SpellOutInt0to999InEN(n) if 0 <= n <= 100 else "invalid number")