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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        char[] c = str.toCharArray();
        int n = c.length;
        
        String ans = "NO";
        for (int i = 0; i < n; i++) {
            for (int j = i; j < n; j++) {
                String now = "";
                for (int k = 0; k < i; k++) {
                    now += c[k];
                }
                for (int k = j; k < n; k++) {
                    now += c[k];
                }
                // System.out.println(now);
                if (now.equals("keyence")) {
                    ans = "YES";
                    break;
                }
            }
        }
        System.out.println(ans);
    }
}