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: Accepted)

import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		String org = "keyence";
		String s = sc.next();
		int idx = 0;
		for (int i = 0; i < s.length(); i++) {
			if (org.charAt(i) != s.charAt(i)) {
				break;
			}
			idx++;
			if (idx == org.length()) {
				System.out.println("YES");
				return;
			}
		}
		for (int i = 0; i < s.length(); i++) {
			if (org.charAt(org.length() - i - 1) != s.charAt(s.length() - i - 1)) {
				break;
			}
			idx++;
			if (idx == org.length()) {
				System.out.println("YES");
				return;
			}
		}
		System.out.println("NO");
	}
}