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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <string.h>
int main() {
	char s[101], key[8] = "keyence";
	scanf("%s", s);
	int cnt = 0, len = strlen(s);
	for (int i = 0; i <= 7; i++) {
		if (s[i] != key[i]) {
			cnt = 7 - i;
			break;
		}
	}
	for (int i = 0; i < cnt; i++) {
		if (s[len - i - 1] != key[6 - i]) {
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}