#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, len;
  string st;
  cin >> st;
  len = st.length();
  if (st == "0") {
    cout << "zero";
    return 0;
  }
  if (st == "10") {
    cout << "ten";
    return 0;
  }
  if (st == "11") {
    cout << "eleven";
    return 0;
  }
  if (st == "12") {
    cout << "twelve";
    return 0;
  }
  if (st == "13") {
    cout << "thirteen";
    return 0;
  }
  if (st == "14") {
    cout << "fourteen";
    return 0;
  }
  if (st == "15") {
    cout << "fifteen";
    return 0;
  }
  if (st == "16") {
    cout << "sixteen";
    return 0;
  }
  if (st == "17") {
    cout << "seventeen";
    return 0;
  }
  if (st == "18") {
    cout << "eighteen";
    return 0;
  }
  if (st == "19") {
    cout << "nineteen";
    return 0;
  }
  if (len == 2) {
    if (st[0] == '2') cout << "twenty";
    if (st[0] == '3') cout << "thirty";
    if (st[0] == '4') cout << "forty";
    if (st[0] == '5') cout << "fifty";
    if (st[0] == '6') cout << "sixty";
    if (st[0] == '7') cout << "seventy";
    if (st[0] == '8') cout << "eighty";
    if (st[0] == '9') cout << "ninety";
    st.erase(0, 1);
  }
  if (len == 2 && st[0] != '0') cout << "-";
  if (st[0] == '1') cout << "one";
  if (st[0] == '2') cout << "two";
  if (st[0] == '3') cout << "three";
  if (st[0] == '4') cout << "four";
  if (st[0] == '5') cout << "five";
  if (st[0] == '6') cout << "six";
  if (st[0] == '7') cout << "seven";
  if (st[0] == '8') cout << "eight";
  if (st[0] == '9') cout << "nine";
  return 0;
}
