#include <bits/stdc++.h>
using namespace std;
string ls[] = {"",     "one", "two",   "three", "four",
               "five", "six", "seven", "eight", "nine"};
string fr[] = {"",      "",      "twenty",  "thirty", "forty",
               "fifty", "sixty", "seventy", "eighty", "ninety"};
int main() {
  ios_base::sync_with_stdio(false);
  int n;
  cin >> n;
  int first = n / 10, second = n % 10;
  switch (n) {
    case 0:
      cout << "zero" << endl;
      break;
    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;
    default: {
      if (!first)
        cout << ls[second] << endl;
      else if (!second)
        cout << fr[first] << endl;
      else
        cout << fr[first] << '-' << ls[second] << endl;
    }
  }
}
