Problem:
Score : 200 points

Problem Statement

A string is called a KEYENCE string when it can be changed to keyence by removing its contiguous substring (possibly empty) only once.

Given a string S consisting of lowercase English letters, determine if S is a KEYENCE string.

Constraints

The length of S is between 7 and 100 (inclusive).

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is a KEYENCE string, print YES; otherwise, print NO.

Sample Input 1

keyofscience

Sample Output 1

YES

keyence is an abbreviation of key of science.

Sample Input 2

mpyszsbznf

Sample Output 2

NO

Sample Input 3

ashlfyha

Sample Output 3

NO

Sample Input 4

keyence

Sample Output 4

YES

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(){
  char s[100];
  char k[] = "keyence";
  scanf("%s",s);
  int len = (int) strlen(s);
  int i,j;
  int d = 0;
  for(i=0;i<8;i++) {
    int c = 0;
    for(j=0;j<7;j++) {
      if(i+j<7) {
        if (s[j] == k[j]) {
          c++;
        }
      } else {
        if(s[j+len-7] == k[j]) {
          c++;
        }
      }
    }
    if(c==7) {
      d++;
    }
  }
  if(d>0) {
    printf("YES\n");
  } else {
    printf("NO\n");
  }
  return 0;
}