#include <bits/stdc++.h>
using namespace std;
int main() {
  int t, i, j, k, l, m, n;
  char s[1000];
  cin >> s;
  l = strlen(s);
  for (i = 0; i < l; i++) {
    if (s[i] == 'k') {
      if (s[i + 1] == 'e') {
        if (s[i + 2] == 'y') {
          if (s[i + 3] == 'e') {
            if (s[i + 4] == 'n') {
              if (s[i + 5] == 'c') {
                if (s[i + 6] == 'e') {
                  cout << "YES";
                  return 0;
                }
                for (j = i + 6; j < l; j++) {
                  if (s[j] == 'e') {
                    cout << "YES";
                    return 0;
                  }
                }
                cout << "NO";
                return 0;
              }
              for (j = i + 5; j < l; j++) {
                if (s[j] == 'c' && s[j + 1] == 'e') {
                  cout << "YES";
                  return 0;
                }
              }
              cout << "NO";
              return 0;
            }
            for (j = i + 4; j < l; j++) {
              if (s[j] == 'n' && s[j + 1] == 'c' && s[j + 2] == 'e') {
                cout << "YES";
                return 0;
              }
            }
            cout << "NO";
            return 0;
          }
          for (j = 1 + 3; j < l; j++) {
            if (s[j] == 'e' && s[j + 1] == 'n' && s[j + 2] == 'c' &&
                s[j + 3] == 'e') {
              cout << "YES";
              return 0;
            }
          }
          cout << "NO";
          return 0;
        }
        for (j = i + 2; j < l; j++) {
          if (s[j] == 'y' && s[j + 1] == 'e' && s[j + 2] == 'n' &&
              s[j + 3] == 'c' && s[j + 4] == 'e') {
            cout << "YES";
            return 0;
          }
        }
        cout << "NO";
        return 0;
      }
      for (j = i + 1; j < l; j++) {
        if (s[j] == 'e' && s[j + 1] == 'y' && s[j + 2] == 'e' &&
            s[j + 3] == 'n' && s[j + 4] == 'c' && s[j + 5] == 'e') {
          cout << "YES";
          return 0;
        }
      }
      cout << "NO";
      return 0;
    }
  }
  cout << "NO";
  return 0;
}
