#include <bits/stdc++.h>
int main() {
  char s[100];
  scanf("%s", s);
  int size = strlen(s);
  int betw = 0;
  int count = 0;
  int tmp;
  for (int i = 0; i < size; ++i) {
    if (count == 0 && s[i] == 'k') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 1 && s[i] == 'e') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 2 && s[i] == 'y') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 3 && s[i] == 'e') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 4 && s[i] == 'n') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 5 && s[i] == 'c') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
    } else if (count == 6 && s[i] == 'e') {
      count++;
      if (i - tmp >= 2) {
        betw++;
      }
      tmp = i;
      if ((size - 1) - i >= 1) {
        betw++;
      }
    }
  }
  if (count == 7 && betw <= 1) {
    printf("YES");
  } else {
    printf("NO");
  }
  return 0;
}
