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: Wrong Answer)

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[] c1 = str.toCharArray();
        String s = "keyence";
        char[] c2 = s.toCharArray();
        
        int j = 0;
        for (int i = 0; i < str.length(); i++) {
            if (j == 7) {
                System.out.println("YES");
                return;
            }
            if (c1[i] == c2[j]) {
                j++;
            }
        }
            if (j == 7) {
                System.out.println("YES");
                return;
            }
        System.out.println("NO");
    }
}