#include <bits/stdc++.h>
using namespace std;
char s1[11][10] = {"zero", "one", "two",   "three", "four",
                   "five", "six", "seven", "eight", "nine"};
char s2[11][10] = {"eleven",  "twelve",    "thirteen", "fourteen", "fifteen",
                   "sixteen", "seventeen", "eighteen", "nineteen"};
char s3[11][10] = {"ten",   "twenty",  "thirty", "forty", "fifty",
                   "sixty", "seventy", "eighty", "ninety"};
int main(void) {
  int n;
  while (scanf("%d", &n) == 1) {
    if (n <= 9)
      printf("%s\n", s1[n]);
    else if (11 <= n && n <= 19)
      printf("%s\n", s2[n - 11]);
    else {
      int x = n / 10;
      int y = n % 10;
      printf("%s", s3[x - 1]);
      if (y) printf("-%s", s1[y]);
      puts("");
    }
  }
  return 0;
}
