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.Scanner;
public class Main {

	public static void main(String[] args){
		Scanner stdIn=new Scanner(System.in);
		String S=stdIn.next();
		String S1="";
		String S2="";
		int Slen=S.length();
		int z=0,y=Slen-7,x=0;
		while(y<Slen){
			S1=S.substring(0,z);
			S2=S.substring(y,Slen);
			if((S1+S2).equals("keyence")){
				x++;
				break;
			}
			z++;y++;
		}
		if(x==1)
			System.out.println("YES");
		else
			System.out.println("NO");
	}
}