#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
  string S;
  cin >> S;
  int length = S.size();
  int out = 0;
  int dead = 0;
  int count = 0;
  for (int i = 0; i < length; i++) {
    if (count == 0) {
      if (S[i] == 'k') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
          continue;
        } else
          out++;
      }
    }
    if (count == 1) {
      if (S[i] == 'e') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 2) {
      if (S[i] == 'y') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 3) {
      if (S[i] == 'e') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 4) {
      if (S[i] == 'n') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 5) {
      if (S[i] == 'c') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 6) {
      if (S[i] == 'e') {
        count++;
        out = 0;
        continue;
      } else {
        if (out == 0) {
          dead++;
          out++;
        } else
          out++;
      }
    }
    if (count == 7) {
      if (dead == 0)
        break;
      else {
        dead++;
        break;
      }
    }
  }
  if (count == 7 && dead < 2)
    cout << "YES"
         << "\n";
  else
    cout << "NO"
         << "\n";
  return 0;
}
