import java.util.Scanner;

public class Number0To100ToText2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int number = scanner.nextInt();

        int tens, units;
        String str1[] = {"", "", "twenty", "thirty", "forty", "fifty", "sixty",
                "seventy", "eighty", "ninety", "one hundred"};
        String str2[] = {"zero", "one", "two", "three", "four", "five", "six", "seven",
                "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen",
                "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};

        if (number < 0 || number > 100) {
            System.out.println("invalid number");
        }
        if (number >= 0 && number < 20) {
            System.out.println(str2[number]);
        } else if (number >= 20 && number <= 100) {
            tens = number / 10;
            units = number % 10;
            if (units == 0) {
                System.out.println(str1[tens]);
            } else {
                System.out.println(str1[tens] + " " + str2[units]);
            }
        }
    }
}