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: Wrong Answer)

#include <stdio.h>
#include <string.h>
int main(void) {
	char s[110];
	scanf("%s", s);
	for (int i = 0; i < strlen(s); i++) {
		for (int j = i; j <= strlen(s); j++) {
			char cur[100];
			int temp = 0;
			for (int x = 0; x < strlen(s); x++) {
				if (i <= x && x < j) {
					continue;
				}
				cur[temp] = s[x];
				temp++;
			}
			if (strncmp(cur, "keyence",7) == 0) {
				printf("YES\n");
				return 0;
			}
		}
	}
	printf("NO\n");
	return 0;
}