#include <bits/stdc++.h>
int main(void) {
  char s[101], j = 0, i = 0, sinkou = 0, w = 0;
  scanf("%s", s);
  while (s[i] != '\0') {
    if (sinkou == 0) {
      if (s[i] == 'k') {
        sinkou = 1;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 1) {
      if (s[i] == 'e') {
        sinkou = 2;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 2) {
      if (s[i] == 'y') {
        sinkou = 3;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 3) {
      if (s[i] == 'e') {
        sinkou = 4;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 4) {
      if (s[i] == 'n') {
        sinkou = 5;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 5) {
      if (s[i] == 'c') {
        sinkou = 6;
        w = 0;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    } else if (sinkou == 6) {
      if (s[i] == 'e') {
        sinkou = 7;
        w = 0;
        break;
      } else if (w == 0) {
        j++;
        w++;
      }
      if (j > 1) break;
    }
    i++;
  }
  if (j <= 1 && sinkou == 7)
    printf("YES\n");
  else
    printf("NO\n");
  return 0;
}
