import java.util.Scanner;

public class Number0to100toText {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int number = Integer.parseInt(scanner.nextLine());

        if (number < 20) {
            switch (number) {
                case 0: System.out.println("zero"); break;
                case 1: System.out.println("one"); break;
                case 2: System.out.println("two"); break;
                case 3: System.out.println("three"); break;
                case 4: System.out.println("four"); break;
                case 5: System.out.println("five"); break;
                case 6: System.out.println("six"); break;
                case 7: System.out.println("seven"); break;
                case 8: System.out.println("eight"); break;
                case 9: System.out.println("nine"); break;
                case 10: System.out.println("ten"); break;
                case 11: System.out.println("eleven"); break;
                case 12: System.out.println("twelve"); break;
                case 13: System.out.println("thirteen"); break;
                case 14: System.out.println("fourteen"); break;
                case 15: System.out.println("fifteen"); break;
                case 16: System.out.println("sixteen"); break;
                case 17: System.out.println("seventeen"); break;
                case 18: System.out.println("eighteen"); break;
                case 19: System.out.println("nineteen"); break;
                default: System.out.println("invalid number");
            }
        } else if (number < 100) {
            int tens = number / 10;
            int units = number % 10;
            switch (tens) {
                case 2: System.out.print("twenty"); break;
                case 3: System.out.print("thirty"); break;
                case 4: System.out.print("forty"); break;
                case 5: System.out.print("fifty"); break;
                case 6: System.out.print("sixty"); break;
                case 7: System.out.print("seventy"); break;
                case 8: System.out.print("eighty"); break;
                default: System.out.print("ninety");
            }
            switch (units) {
                case 0: System.out.println(""); break;
                case 1: System.out.println(" one"); break;
                case 2: System.out.println(" two"); break;
                case 3: System.out.println(" three"); break;
                case 4: System.out.println(" four"); break;
                case 5: System.out.println(" five"); break;
                case 6: System.out.println(" six"); break;
                case 7: System.out.println(" seven"); break;
                case 8: System.out.println(" eight"); break;
                default: System.out.println(" nine");
            }
        } else if (number == 100) {
            System.out.println("one hundred");
        } else {
            System.out.println("invalid number");
        }
    }
}