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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.*;
class Main
{
    static int[][] c;
    public static void main (String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String x = "keyence";
        int n = s.length();
        int m = x.length();
        String ans = "NO";
        for(int i = 0; i < n - m; i++){
            int cnt = -1;
            boolean flag = true;
            for(int j = 0; j < i; j++){
                if(s.charAt(j) != x.charAt(++cnt)){
                    flag = false;
                }
            }
            for(int j = n - m + i; j < n; j++){
                if(s.charAt(j) != x.charAt(++cnt)){
                    flag = false;
                }
            }
            if(flag) ans = "YES";
        }
        if(s.compareTo(x) == 0)ans = "YES";
        System.out.println(ans);
    }
}