import java.util.Scanner;
import java.util.Arrays;

public class wordsto {

	public static void main(String[] args) {
		int input = new Scanner(System.in).nextInt();

		int a = (input / 10) -2 ;
	    int b = (input % 10) ;
		String[] zeroToNineteen = new String[]{"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
	            "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};

		String[] tens = new String[]{"twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety"	};

		if(input >= 0 && input <= 100 ){
			if(input >= 0 && input <=19){
				System.out.println(zeroToNineteen[input]);
			}else if(input == 100){
				System.out.println("one hundred");
			}else if(input % 10==0 && input>=20 && input < 100){
				System.out.println(tens[a]);
			}else{
				System.out.println(tens[a] + " " + zeroToNineteen[b]);
			}

		}else{
			System.out.println("invalid number");
		}
	}
}