#include <bits/stdc++.h>
using namespace std;
int n;
void chis(int x) {
  switch (x) {
    case 0:
      cout << "zero" << endl;
      break;
    case 1:
      cout << "one" << endl;
      break;
    case 2:
      cout << "two" << endl;
      break;
    case 3:
      cout << "three" << endl;
      break;
    case 4:
      cout << "four" << endl;
      break;
    case 5:
      cout << "five" << endl;
      break;
    case 6:
      cout << "six" << endl;
      break;
    case 7:
      cout << "seven" << endl;
      break;
    case 8:
      cout << "eight" << endl;
      break;
    case 9:
      cout << "nine" << endl;
      break;
  }
}
void chis2(int x) {
  switch (x) {
    case 2:
      cout << "twenty";
      break;
    case 3:
      cout << "thirty";
      break;
    case 4:
      cout << "forty";
      break;
    case 5:
      cout << "fifty";
      break;
    case 6:
      cout << "sixty";
      break;
    case 7:
      cout << "seventy";
      break;
    case 8:
      cout << "eighty";
      break;
    case 9:
      cout << "ninety";
      break;
  }
}
void chis3(int x) {
  switch (x) {
    case 10:
      cout << "ten" << endl;
      break;
    case 11:
      cout << "eleven" << endl;
      break;
    case 12:
      cout << "twelve" << endl;
      break;
    case 13:
      cout << "thirteen" << endl;
      break;
    case 14:
      cout << "fourteen" << endl;
      break;
    case 15:
      cout << "fifteen" << endl;
      break;
    case 16:
      cout << "sixteen" << endl;
      break;
    case 17:
      cout << "seventeen" << endl;
      break;
    case 18:
      cout << "eighteen" << endl;
      break;
    case 19:
      cout << "nineteen" << endl;
      break;
  }
}
void read() {
  cin >> n;
  if (n <= 9)
    chis(n);
  else {
    int des = n / 10;
    if (des == 1)
      chis3(n);
    else {
      chis2(des);
      int ost = n % 10;
      if (ost == 0)
        cout << endl;
      else {
        cout << '-';
        chis(ost);
      }
    }
  }
}
int main() {
  read();
  return 0;
}
