import java.util.Scanner;
public class From0ToHudred {
    public static void main(String[] args) {

        Scanner console = new Scanner(System.in);

        int num = Integer.parseInt(console.nextLine());

        String firstnum = "";
        String secondnum = "";

        if (num == 0) {
            firstnum="zero";
        }
            if(num==1){
                firstnum="one";
            } else if (num==2) {
                firstnum="two";
            } else if (num==3) {
                firstnum="three";
            }  else if (num==4) {
                firstnum="four";
            }  else if (num==5) {
                firstnum="five";
            }  else if (num==6) {
                firstnum="six";
            }  else if (num==7) {
                firstnum="seven";
            }  else if (num==8) {
                firstnum="eight";
            }  else if (num==9) {
                firstnum="nine";
            }
            if(num==10){
                firstnum="ten";
            }
            if(num==11){
                firstnum="eleven";
            } else if(num==12){
                firstnum="twelve";
            } else if(num==13){
                firstnum="thirteen";
            } else if(num==14){
                firstnum="fourteen";
            } else if(num==15){
                firstnum="fifteen";
            } else if(num==16){
                firstnum="sixteen";
            } else if(num==17){
                firstnum="seventeen";
            } else if(num==18){
                firstnum="eighteen";
            } else if(num==19){
                firstnum="nineteen";
            }



        if (num/10==2) {
            firstnum="twenty";
        } else if (num/10==3) {
            firstnum="thirty";
        } else if (num/10==4) {
            firstnum="forty";
        } else if (num/10==5) {
            firstnum="fifty";
        } else if (num/10==6) {
            firstnum="sixty";
        } else if (num/10==7) {
            firstnum="seventy";
        } else if (num/10==8) {
            firstnum="eighty";
        } else if (num/10==9) {
            firstnum="ninety";
        }

        if (num > 20 && num%10==2) {
            secondnum="two";
        } else if (num > 20 &&num%10==3) {
            secondnum="three";
        } else if (num > 20 &&num%10==4) {
            secondnum="four";
        } else if (num > 20 &&num%10==5) {
            secondnum="five";
        } else if (num > 20 &&num%10==6) {
            secondnum="six";
        } else if (num > 20 &&num%10==7) {
            secondnum="seven";
        } else if (num > 20 &&num%10==8) {
            secondnum="eight";
        } else if (num > 20 &&num%10==9) {
            secondnum="nine";
        }


            if (num == 100) {
                firstnum="one hundred";
            }
            if(num < 0 || num > 100){
                System.out.println("invalid number");
            } else if (secondnum.equals(null)){
                System.out.print(firstnum);
            } else {
                System.out.print(firstnum+" "+secondnum);
            }


    }
}