#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string n2[] = {"",      "",      "twenty",  "thirty", "forty",
                 "fifty", "sixty", "seventy", "eighty", "ninety"};
  string n1[] = {"zero",    "one",     "two",       "three",    "four",
                 "five",    "six",     "seven",     "eight",    "nine",
                 "ten",     "eleven",  "twelve",    "thirteen", "fourteen",
                 "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
  if (0 <= n && n <= 19) {
    cout << n1[n] << endl;
  } else {
    int x;
    x = n % 10;
    if (x == 0)
      cout << n2[n / 10] << endl;
    else
      cout << n2[n / 10] << "-" << n1[x] << endl;
  }
  return 0;
}
