numbers

import java.util.Scanner;

public class Task16 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = Integer.parseInt(scanner.nextLine());
        int firstNum = num / 10;
        int secondNum = num % 10;
        boolean invalid = num < 0 || num > 100;
        boolean valid = num > 0 && num < 100;
        if (invalid) {
            System.out.println("invalid number");
        } else if (num == 0) {
            System.out.println("zero");
        } else if (num == 100) {
            System.out.println("one hundred");
        }
        if (firstNum == 1) {

            if (secondNum == 0) {
                System.out.println("ten");
            } else if (secondNum == 1) {
                System.out.println("eleven");
            } else if (secondNum == 2) {
                System.out.println("twelve");
            } else if (secondNum == 3) {
                System.out.println("thirteen");
            } else if (secondNum == 4) {
                System.out.println("fourteen");
            } else if (secondNum == 5) {
                System.out.println("fifteen");
            } else if (secondNum == 6) {
                System.out.println("sixteen");
            } else if (secondNum == 7) {
                System.out.println("seventy");
            } else if (secondNum == 8) {
                System.out.println("eighty");
            } else if (secondNum == 9) {
                System.out.println("nineteen");
            }
        } else if (firstNum == 2) {
            System.out.print("twenty");
        } else if (firstNum == 3) {
            System.out.print("thirty");
        } else if (firstNum == 4) {
            System.out.print("forty");
        } else if (firstNum == 5) {
            System.out.print("fifty");
        } else if (firstNum == 6) {
            System.out.print("sixty");
        } else if (firstNum == 7) {
            System.out.print("seventy");
        } else if (firstNum == 8) {
            System.out.print("eighty");
        } else if (firstNum == 9) {
            System.out.print("ninety");

        } if (secondNum != 0 && firstNum > 1 && num < 100){
            System.out.print(" ");
        }
        if (secondNum == 1 && firstNum != 1 && valid) {
            System.out.print("one");
        } else if (secondNum == 2 && firstNum != 1 && valid) {
            System.out.print("two");
        } else if (secondNum == 3 && firstNum != 1 && valid) {
            System.out.print("three");
        } else if (secondNum == 4 && firstNum != 1 && valid) {
            System.out.print("four");
        } else if (secondNum == 5 && firstNum != 1 && valid) {
            System.out.print("five");
        } else if (secondNum == 6 && firstNum != 1 && valid) {
            System.out.print("six");
        } else if (secondNum == 7 && firstNum != 1 && valid) {
            System.out.print("seven");
        } else if (secondNum == 8 && firstNum != 1 && valid) {
            System.out.print("eight");
        } else if (secondNum == 9 && firstNum != 1 && valid) {
            System.out.print("nine");
        }
    }
}