import java.util.Scanner;

public class OnetoHundred {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = Integer.parseInt(scanner.nextLine());
        int b = 0;
        int c = 0;
        String bword = "";
        String cword = "";

        if (a < 0 || a > 100) {
            System.out.println("invalid number");
        } else if (a == 0) {
            System.out.println("zero");
        } else if (a == 100) {
            System.out.println("one hundred");
        } else if (a > 0 && a < 20) {
            if (a == 1) {
                System.out.println("one");
            }
            if (a == 2) {
                System.out.println("two");
            }
            if (a == 3) {
                System.out.println("three");
            }
            if (a == 4) {
                System.out.println("four");
            }
            if (a == 5) {
                System.out.println("five");
            }
            if (a == 6) {
                System.out.println("six");
            }
            if (a == 7) {
                System.out.println("seven");
            }
            if (a == 8) {
                System.out.println("eight");
            }
            if (a == 9) {
                System.out.println("nine");
            }
            if (a == 10) {
                System.out.println("ten");
            }
            if (a == 11) {
                System.out.println("eleven");
            }
            if (a == 12) {
                System.out.println("twelve");
            }
            if (a == 13) {
                System.out.println("thirteen");
            }
            if (a == 14) {
                System.out.println("fourteen");
            }
            if (a == 15) {
                System.out.println("fifteen");
            }
            if (a == 16) {
                System.out.println("sixteen");
            }
            if (a == 17) {
                System.out.println("seventeen");
            }
            if (a == 18) {
                System.out.println("eighteen");
            }
            if (a == 19) {
                System.out.println("nineteen");
            }
        } else if (a > 19 && a < 100) {
            b = a / 10;
            c = a % 10;
            if (b == 2)
                bword = "twenty";
            if (b == 3)
                bword = "thirty";
            if (b == 4)
                bword = "forty";
            if (b == 5)
                bword = "fifty";
            if (b == 6)
                bword = "sixty";
            if (b == 7)
                bword = "seventy";
            if (b == 8)
                bword = "eighty";
            if (b == 9)
                bword = "ninety";
            if (c == 1)
                cword = "one";
            if (c == 2)
                cword = "two";
            if (c == 3)
                cword = "three";
            if (c == 4)
                cword = "four";
            if (c == 5)
                cword = "five";
            if (c == 6)
                cword = "six";
            if (c == 7)
                cword = "seven";
            if (c == 8)
                cword = "eight";
            if (c == 9)
                cword = "nine";
            if (c == 0) {
                System.out.println(bword);
            } else System.out.println(bword + " " + cword);
        }
    }
}