#include <bits/stdc++.h>
using namespace std;
void print1(int num) {
  switch (num) {
    case 0:
      cout << "zero";
      break;
    case 1:
      cout << "one";
      break;
    case 2:
      cout << "two";
      break;
    case 3:
      cout << "three";
      break;
    case 4:
      cout << "four";
      break;
    case 5:
      cout << "five";
      break;
    case 6:
      cout << "six";
      break;
    case 7:
      cout << "seven";
      break;
    case 8:
      cout << "eight";
      break;
    case 9:
      cout << "nine";
      break;
  }
}
void print2(int num) {
  switch (num) {
    case 1:
      cout << "ten";
      break;
    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;
  }
}
int main() {
  int n;
  while (cin >> n) {
    if (n < 10) {
      print1(n);
    } else if (n % 10 == 0) {
      print2(n / 10);
    } else if (n < 20) {
      switch (n) {
        case 11:
          cout << "eleven";
          break;
        case 12:
          cout << "twelve";
          break;
        case 13:
          cout << "thirteen";
          break;
        case 14:
          cout << "fourteen";
          break;
        case 15:
          cout << "fifteen";
          break;
        case 16:
          cout << "sixteen";
          break;
        case 17:
          cout << "seventeen";
          break;
        case 18:
          cout << "eighteen";
          break;
        case 19:
          cout << "nineteen";
          break;
      }
    } else {
      print2(n / 10);
      cout << "-";
      print1(n % 10);
    }
    cout << endl;
  }
  return 0;
}
