#include <bits/stdc++.h>
using namespace std;
string c[11] = {"null", "one", "two",   "three", "four",
                "five", "six", "seven", "eight", "nine"};
string t[11] = {"ten",      "eleven",   "twelve",  "thirteen",
                "fourteen", "fifteen",  "sixteen", "seventeen",
                "eighteen", "nineteen", "twenty"};
int main() {
  int num;
  cin >> num;
  string code;
  if (num == 0) {
    cout << "zero" << endl;
    return 0;
  }
  int temp = num;
  while (temp != 0) {
    code += (temp % 10 + '0');
    temp = temp / 10;
  }
  reverse(code.begin(), code.end());
  if (code.length() == 1) {
    cout << c[num] << endl;
    return 0;
  }
  if (num == 30) {
    cout << "thirty" << endl;
    return 0;
  }
  if (num == 40) {
    cout << "forty" << endl;
    return 0;
  }
  if (num == 50) {
    cout << "fifty" << endl;
    return 0;
  }
  if (num == 60) {
    cout << "sixty" << endl;
    return 0;
  }
  if (num == 70) {
    cout << "seventy" << endl;
    return 0;
  }
  if (num == 80) {
    cout << "eighty" << endl;
    return 0;
  }
  if (num == 90) {
    cout << "ninety" << endl;
    return 0;
  } else if (num >= 10 && num <= 20) {
    cout << t[num - 10] << endl;
    return 0;
  } else if (num > 20 && num < 30) {
    cout << "twenty-" << c[num - 20] << endl;
    return 0;
  } else if (num > 30 && num < 40) {
    cout << "thirty-" << c[num - 30] << endl;
    return 0;
  } else if (num > 40 && num < 50) {
    cout << "forty-" << c[num - 40] << endl;
    return 0;
  } else if (num > 50 && num < 60) {
    cout << "fifty-" << c[num - 50] << endl;
    return 0;
  } else if (num > 60 && num < 70) {
    cout << "sixty-" << c[num - 60] << endl;
    return 0;
  } else if (num > 70 && num < 80) {
    cout << "seventy-" << c[num - 70] << endl;
    return 0;
  } else if (num > 80 && num < 90) {
    cout << "eighty-" << c[num - 80] << endl;
    return 0;
  } else if (num > 90 && num < 100) {
    cout << "ninety-" << c[num - 90] << endl;
    return 0;
  }
}
