#include <bits/stdc++.h>
int main() {
  int n, rem1, rem2;
  scanf("%d", &n);
  char s1[20][10] = {"zero",    "one",     "two",       "three",    "four",
                     "five",    "six",     "seven",     "eight",    "nine",
                     "ten",     "eleven",  "twelve",    "thirteen", "fourteen",
                     "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
  char s2[8][10] = {"twenty", "thirty",  "forty",  "fifty",
                    "sixty",  "seventy", "eighty", "ninety"};
  if (n <= 19)
    printf("%s", s1[n]);
  else {
    rem1 = n % 10;
    rem2 = n / 10;
    if (rem1 == 0)
      printf("%s", s2[rem2 - 2]);
    else
      printf("%s-%s", s2[rem2 - 2], s1[rem1]);
  }
}
