import java.util.Scanner;

public class e16_Number1_100ToText {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int number = Integer.parseInt(console.nextLine());
        int firstDigit = number / 10;
        int seconDigit = number % 10;
        if (number <= 10 && number >=0) {
            if (number == 0) {
                System.out.println("zero");
            } else if (number == 1) {
                System.out.println("one");
            } else if (number == 2) {
                System.out.println("two");
            } else if (number == 3) {
                System.out.println("three");
            } else if (number == 4) {
                System.out.println("four");
            } else if (number == 5) {
                System.out.println("five");
            } else if (number == 6) {
                System.out.println("six");
            } else if (number == 7) {
                System.out.println("seven");
            } else if (number == 8) {
                System.out.println("eight");
            } else if (number == 9) {
                System.out.println("nine");
            } else if (number == 10) {
                System.out.println("ten");
            }
        } else if (number < 20 && number >10) {
            if (seconDigit == 1) {
                System.out.println("eleven");
            } else if (seconDigit == 2) {
                System.out.println("twelve");
            } else if (seconDigit == 3) {
                System.out.println("thirteen");
            } else if (seconDigit == 4) {
                System.out.println("fourteen");
            } else if (seconDigit == 5) {
                System.out.println("fifteen");
            } else if (seconDigit == 6) {
                System.out.println("sixteen");
            } else if (seconDigit == 7) {
                System.out.println("seventeen");
            } else if (seconDigit == 8) {
                System.out.println("eighteen");
            } else if (seconDigit == 9) {
                System.out.println("nineteen");
            }
        } else if (number < 100 && number >=20) {
            if (firstDigit == 2) {
                System.out.print("twenty");
            } else if (firstDigit == 3) {
                System.out.print("thirty");
            } else if (firstDigit == 4) {
                System.out.print("forty");
            } else if (firstDigit == 5) {
                System.out.print("fifty");
            } else if (firstDigit == 6) {
                System.out.print("sixty");
            } else if (firstDigit == 7) {
                System.out.print("seventy");
            } else if (firstDigit == 8) {
                System.out.print("eighty");
            } else if (firstDigit == 9) {
                System.out.print("ninety");
            }
            if (seconDigit == 1) {
                System.out.println(" one");
            } else if (seconDigit == 2) {
                System.out.println(" two");
            } else if (seconDigit == 3) {
                System.out.println(" three");
            } else if (seconDigit == 4) {
                System.out.println(" four");
            } else if (seconDigit == 5) {
                System.out.println(" five");
            } else if (seconDigit == 6) {
                System.out.println(" six");
            } else if (seconDigit == 7) {
                System.out.println(" seven");
            } else if (seconDigit == 8) {
                System.out.println(" eight");
            } else if (seconDigit == 9) {
                System.out.println(" nine");
            }
        } else if (number == 100) {
            System.out.println("one hundred");
        } else System.out.println("invalid number");

    }
}