#include <bits/stdc++.h>
int main(void) {
  char str[100];
  int counter = 0;
  int flag[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  int is_end = 0;
  scanf("%s", str);
  for (int i = 0; i < strlen(str); i++) {
    switch (counter) {
      case 0:
        if (str[i] == 'k') {
          counter++;
        } else {
          flag[0] = 1;
        }
        break;
      case 1:
        if (str[i] == 'e') {
          counter++;
        } else {
          flag[1] = 1;
        }
        break;
      case 2:
        if (str[i] == 'y') {
          counter++;
        } else {
          flag[2] = 1;
        }
        break;
      case 3:
        if (str[i] == 'e') {
          counter++;
        } else {
          flag[3] = 1;
        }
        break;
      case 4:
        if (str[i] == 'n') {
          counter++;
        } else {
          flag[4] = 1;
        }
        break;
      case 5:
        if (str[i] == 'c') {
          counter++;
        } else {
          flag[5] = 1;
        }
        break;
      case 6:
        if (str[i] == 'e') {
          counter++;
          is_end = 1;
        } else {
          flag[6] = 1;
        }
        break;
      case 7:
        flag[7] = 1;
        break;
    }
  }
  if (is_end == 1) {
    int count = 0;
    for (int i = 0; i < 8; i++) {
      if (flag[i]) {
        count++;
      }
    }
    if (count == 0 || count == 1) {
      printf("YES\n");
      return 0;
    }
  }
  printf("NO\n");
  return 0;
}
